* Flint 2.4 (2020-09-29)

** Supported platforms
   - Windows 7 or later.
   - macOS: OS X El Capitan (10.11) or later.
     This version may still run on OS X Yosemite (10.10), but it is no longer
     supported.
   - Linux distributions such as Debian 10, Ubuntu 18.04, and RHEL/CentOS 7 & 8.
** Improvements
   - Improved access to log messages of a simulation job.
   - Example model files are included in source and binary distribution.
** Bug fixes
   - #8 Fixed a bug unabling to produce simulation output on RHEL/CentOS 7.
   - #17 Fixed error at parsing "x+1" in the Expression of Parameters tab.

* Flint 2.3 (2020-03-18)

** Supported platforms
   - Windows 7 or later.
   - macOS: OS X Yosemite (10.10) or later.
     This version may still run on OS X Mavericks (10.9), but it is no longer
     supported.
   - Linux distributions such as Debian 10, Ubuntu 18.04, and RHEL/CentOS 7 & 8.
** Improvements
   - Flint now consists of smaller binaries than the ones of previous releases.
** Bug fixes
   - #3 Fixed crash on macOS when exporting multiple results.
   - #4 Fixed frame shrinkage of Preference window on GTK 3.
   - #11 Fixed crash on macOS when starting a simulation of multiple jobs.

* Flint 2.2 (2019-06-19)

** Supported platforms
   - Windows 7 or later.
   - macOS: OS X Mavericks (10.9) or later.
   - Linux distributions such as Debian 9, Ubuntu 18.04, and RHEL/CentOS 7.
     RHEL/CentOS 6 is no longer supported.
** New features
   - Added an experimental support of the Euler-Maruyama method to solve Itô
     stochastic differential equations.
** Improvements
   - Support MathML's <cn> of type="rational" to represent rational numbers.
   - The executable distributed as the official binary package for macOS
     runs faster than the previous release's.
** Bug fixes
   - Fixed a Gaussian pseudo-random number generation.
   - Using the seed specified in a PHML model for pseudo-random numbers.

* Flint 2.1.1 (2019-02-01)

** Target platforms
   - macOS: OS X Mavericks (10.9) or later.
** Bug fixes
   - Fix crash at launch on macOS.

* Flint 2.1 (2018-10-15)

** Supported platforms
   - Windows 7 or later.
   - macOS: OS X Mavericks (10.9) or later.
   - Linux distributions such as Debian 9, RHEL/CentOS 6, and RHEL/CentOS 7.
** New features
   - Added a window to show and save the gnuplot script plotting line chart.
   - Allow to give a hint of concurrency in the preference window or as
     flint-exec's input.
   - Save configuration into a directory via CTRL+S.
** Improvements
   - Improved thread safety on parameter fitting.
   - Performance optimizations.
** Bug fixes
   - Fix unexpected hangs.

* Flint 2.0 (2018-04-09)

** Supported platforms
   - Windows: Windows 7, 8, and 10.
   - macOS: OS X Mavericks (10.9) or later.
   - Linux distributions such as Debian 9, RHEL/CentOS 6, and RHEL/CentOS 7.
** New features
   - New main program, formerly called flint2, supersedes the original one.
** Improvements
   - The size of installed binary gets smaller than ever.
   - The windows installer refrains from adding Flint's folder to PATH.
   - Programs of Windows version run faster, thanks to switch from MinGW-w64
     to MSVC.
** Major changes from Flint 1.9
   - Flint no longer depends on Java runtime environment.
   - Flint now calls Gnuplot to render line charts of simulation result;
     you may have to install Gnuplot and must specify the path of its executable
     with Flint's preference menu.

* Flint 1.9 (2017-11-10)

** Supported platforms
   - Windows: Windows 7, 8, and 10.
   - macOS: OS X Mavericks (10.9) or later;
     OS X Mountain Lion (10.8) is no longer supported.
   - POSIX-like environments, including modern Linux.
** New features
   - Added a program called flint-lodbg, which dumps data layout used during
     simulation for debugging purpose, reading from a layout file.
   - flint2 now experimentally supports CellML and SBML models, as well as
     more menus.
** Improvements
   - isdplot prints more informative message on errors.
   - isdbswap now allows input ISDF to include empty comment.
   - csv2isd exits with status 0 at --help.

* Flint 1.8 (2017-06-09)

** Supported platforms
   - OS X Lion (10.7) is no longer supported.
   - OS X Mountain Lion (10.8) support is now deprecated; it will be dropped
     with incoming v1.9 release.
   - Java 7 support is also deprecated.
** New features
   - Added a program called flint2 as an experimental feature, a prototype
     of next-generation simulator, currently only supporting PHML models.
     Please note that it is unstable and still under heavy development.
** Improvements
   - Loading a model got faster with more efficient parser.
   - Allow floating-point number literals to end with "."; for example,
     "-2." is now a valid representation of a negative two.
   - isdplot's command options --isdstrip and --isd2csv have been dropped;
     user no longer has to specify either. In addition, --gnuplot option
     is optional now; gnuplot in PATH is chosen by default.
   - isdplot and isd2csv now accept two new options: --ignore-prefixes (-P)
     and --ignore-units (-U).

* Flint 1.7.1 (2016-12-28)

** Bug fixes
   - Fixed a GUI hang occurring when e.g. invalid time step is specified in
     general setting.

* Flint 1.7 (2016-10-31)

** New features
   - The menu added to export a C source file for simulation from a model.
     Currently the feature supports only pure ODE models.
** Bug fixes
   - Fixed nasty bugs in isddiff; now it detects differences properly
     as well as NaN.

* Flint 1.6.1 (2016-08-31)

** Bug fixes
   - Fixed an error "failed to step statement: 5" when starting simulation
     on Windows 10
   - Fixed an error "failed to commit transaction: 5: database is locked"
     happening occasionally when pushing button "Run" on Windows 7

* Flint 1.6 (2016-07-29)

** New features
   - Shortcut keys Escape and Ctrl+W (or Cmd+W on Mac) can close subwindows.
** Improvements
   - Calculation time for time evolution has been reduced by about 30% agaist
     the previous version.
   - Output variables no longer includes redundant ones, such as any PHML
     variable-parameters assigned to an input port which has a unique edge
     of reduction "sum".
   - Parameters in a PHML model are limited to static-parameters and initial
     values defined by a formula that does not depends on other parameters.
** Bug fixes
   - Flint now accepts a simulation request from localhost only.

* Flint 1.5 (2016-06-29)

** New features
   - SUNDIALS's ARK solver is available as ARK method; note that, for now,
     this is for pure ODE models only.
   - Support for the modulo operation as csymbol function "Mod" in PHML.
   - It is now possible to send a CSV or ISD file to another gadget through
     the Garuda protocol.
** Improvements
   - Simulation got faster; simulation time reduced by about 30%.
   - Now it can detect non-state physical-quantities defined by ODEs in PHML
     as a model error.
   - The error dialog on simulation failure becomes resizable.
   - <description> can appear in PHML's <arc>.
   - PHML's <transition type="probability"> allows any MathML expression as
     its value.
   - For security reason, user's Flint K3 account is no longer saved.
   - It works with Garuda platform 1.2.
   - Some error messages become more informative.
** Bug fixes
   - Missing edges in a PHML model can be detected more reliably.
   - flint-exec's processes no longer remain running after Flint's exit.
   - An error dialog appears as soon as the loading process exits abnormally.