add allinone.coffee
Remove only the '--' that puts a '-' in the pattern.
http://bugs.python.org/issue13922
was that all '--' were removed
then py was changed to remove the 1st in each group of positional args

This removes only one '--'
change how $$ (const) is imported

argcoffee - change many of the aliases to use ::

add args_default_to_positional option
python issue9334
(note: allinone has tests for this, but the code)
plac
embed tests in do()
try to use allinone if available