1.00:
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 * Add conceptional root namespace to error exception handling for consistency
 * Raises requirements
 * Remove legacy and XHTML11
 * Remove PHP UNIT tests while mostly for legacy

0.25:
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 * Modernize strike button to <del> (html5)

0.24:
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 * In absence of constructor parameters - remove parentheses for consistency

0.23:
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 * Cleanup and consistency

0.22:
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 * Complete refactoring of serendipity_event_typesetbuttons