BF: iohub python 3 compatibility

[ariekahn]

A few minor issues cropping up with iohub on Python 3:

1. trailing commas were causing a few of the keycodes to be represented as tuples, which was ignored in python 2 but in 3 gives:

TypeError: '>' not supported between instances of 'tuple' and 'int'

2. darwinkey needed to be a relative import

3. locals() returns a view in python 3, which means we can't change it when iterating over it. Explicitly creating a copy should preserve the old behavior.

[peircej]

Great. Well done. I think we're going to find quite a few of these issues, especially in iohub, so it's good to have someone jumping in there on it. I'll be trying to push out a few quick bug-fix releases.

Oh, one thing though, could you annotate your commits in future with BF: for bug-fixes FF: for fixes to not-yet-released features and ENH for new features/enhancements. The labels in the oull request doesn't matter but the commit message is important. When I create a bug fix release I typically do that in a separate git branch and only commits tagged with BF: get included

[coveralls]

Coverage increased (+0.006%) to 51.767% when pulling 7cd627c on ariekahn:FIX/iohub-py3-issues into 0133fbc on psychopy:master.

[codecov-io]

Codecov Report

Merging #1775 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1775      +/-   ##
==========================================
+ Coverage   47.08%   47.09%   +0.01%     
==========================================
  Files         218      218              
  Lines       33284    33284              
  Branches     5556     5556              
==========================================
+ Hits        15671    15675       +4     
+ Misses      16055    16053       -2     
+ Partials     1558     1556       -2

Impacted Files	Coverage Δ
psychopy/data/base.py	71.87% <0%> (-0.9%)	⬇️
psychopy/tools/wizard.py	74.45% <0%> (+0.65%)	⬆️
psychopy/visual/textbox/fontmanager.py	69.96% <0%> (+1.02%)	⬆️

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[ariekahn]

My bad! Will annotate any commits themselves in the future.