argparse: handle --param=5 just like --param 5#293
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Copies getopt_long behavior, where either space or equals are valid separators between options and values. Does not allow `-p=5` since getopt doesn't allow equals signs in short options. Passing values to short options still requires spaces.
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This copies
getopt_longbehavior, where either space or equals are valid separators between options and values.This PR does not allow
-p=5sincegetoptdoesn't allow equals signs in short options (at least, that's not documented). Passing values to short options still requires spaces. If equals signs between option and value are desirable in short options, it would be quite easy to add that later.Fixes #292.