Added list to core_args and added check for no-dedup. Program was ass…

[jordoncm]

…uming these would be a part of the flag structure which breaks creation of a Program.run where a namespace is passed in.

Consider the self contained python script ./foo

#!/usr/bin/env python

import sys

import invoke

@invoke.task
def build():
  print 'built!'

if __name__ == '__main__':
  namespace = invoke.Collection()
  namespace.add_task(build)
  program = invoke.Program(
    name='Foo',
    binary='foo',
    version='0.1',
    namespace=namespace
  )
  program.run(sys.argv)

invoke.Program would except because it assumes self.args.list was defined. The list operation makes sense to be a part of core_args in this use case. After fixing this invoke.Program excepts again assuming self.args['no-dedup'] is defined.

[bitprophet]

Thanks for the catch. I assume I chopped up the core-args vs non-core-args stuff that way on purpose, so need to doublecheck the tickets & git history for it to be sure this won't cause another problem. But could've just been an oversight.

[jordoncm]

The other solution to this is to not assume self.args.list is present here (possibly elsewhere too): https://github.com/pyinvoke/invoke/blob/master/invoke/program.py#L341

[bitprophet]

I assume I chopped up the core-args vs non-core-args stuff that way on purpose

Revisiting this now that it's biting me in my dayjob use - I can see why I initially thought "don't expose --list, we're pretending to be a Real Program with Real Subcommands". However, I myself attempted to do custombinary --list recently, implying it's intuitive if you're used to Invoke itself.

Given that I hate unintuitive things and it's not super likely that non-Invoke users will be bothered by its existence...and of course given that having it in the non-core args is causing problems...I think probably OK to shuffle it around for now, as per this PR.

[bitprophet]

Also, @sophacles made the same argument re: inclusion of list in this comment some time ago (re #276). So one less thing for that branch to handle whenever I get back to it (sob).

[bitprophet]

We don't seem to cover the core bug this fixes in either the unit or integration test suites, sadface. Will whip one up.

[bitprophet]

All set + tests + changelog, thanks again!