User's Guide version 3.8

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Updates for this version:

• New sections:
• "Generating ensembles with RANDOMCV"
• "Other data formats" describing the new AMSR2 observations
• "Utilizing the Weak Penalty Constraint option", a new capability for 3.8
• "Modifying CV3 length scales and variance"
• HDF5 compilation instructions for reading AMSR2 observation files
• New options/default values in the "Description of Namelist Variables" section.
• Many minor updates/corrections