Add 'double_flags' option -- from Lapin0t #6
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Adds the option to specify "double_flags=False" to avoid generating flags for the default option. (EG, if default is 'foo=True', it will only generate '--no-foo' option and not the redundant '--foo' option.)
double_flags defaults to True (ie, the same behaviour as before).
This patch also changes the order flag arguments are generated in; the non-default is always generated first (ie '--foo' if default false, '--no-foo' if default true). A test case has been updated to reflect this change.