narrowbundle2: more kwargs native string fixes This gets test-narrow.t to *almost* pass. Something appears to be borked in producing bundles, but only some of the time? I'm lost, but this change is at least a clear improvement. # skip-blame just more r prefixes on strings Differential Revision: https://phab.mercurial-scm.org/D2389

py3: whitelist another 11 passing tests This is most of narrow. There's still some buglets at the margins, but it's pretty good progress for not a lot of work. Differential Revision: https://phab.mercurial-scm.org/D2388

narrowbundle2: use native string to get kwargs from dict # skip-blame just some r prefixes on strings Differential Revision: https://phab.mercurial-scm.org/D2387

narrowbundle2: drop legacy getcgkwargs variable I think this was around as part of support for some older hg internals. It's not needed any more. Differential Revision: https://phab.mercurial-scm.org/D2386

fancyopts: add support for custom multi-arg opts in fancyopts.py This allows for more complex multi-arg opt logic, such as "--sum 1 --sum 2" -> 3, "--csv alice,bob --csv charlie" -> ["alice","bob","charlie"]. The current support for callables is insufficient for this. This is done by introducing a 'customopt' class which can be extended for more powerful opts logic. All existing opt-types are converted to use this class, simplifying the fancyopts() logic. Differential Revision: https://phab.mercurial-scm.org/D2090

narrowcommands: add some missing strkwargs calls for py3 # skip-blame because it's just r prefixes Differential Revision: https://phab.mercurial-scm.org/D2367

narrowwirepeer: add some strkwargs to fix a crash on py3 # skip-blame because it's just some r prefixes Differential Revision: https://phab.mercurial-scm.org/D2366