refactor: rework mime type comparison and clean code rest.py: accept application/* as match for application/json in non /binary_context rest path. allow defining default mime type to return when file/message is missing mime type. Make it a class variable to it can be changed from text/plain to text/markdown or whatever. extract code from determine_output_format() to create create_valid_content_types() method which returns a list of matching mime types for a given type/subtype. Eliminate mostly duplicate return statements by introducing a variable to specify valid mime types in error message. rest_common.py: Fix error messages that now return application/* as valid mime type. CHANGES.txt upgrading.txt rest.txt: top level notes and corrections. Also correct rst syntax on earlier change.

# In Python 3 the "anydbm" module was renamed to be "dbm" which is now a
# package containing the various implementations. The "wichdb" module's
# whichdb() function was moved to the new "dbm" module.

try:
    # old school first because <3 had a "dbm" module too...
    import anydbm
    from whichdb import whichdb
except ImportError:
    # python 3+
    import dbm as anydbm
    whichdb = anydbm.whichdb