Populate options

[awnawab]

This PR adds the ability to specify options for the populate step, both as bundle flags and as default values associated with a particular project.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 93.40659% with 6 lines in your changes missing coverage. Please review.

Project coverage is 40.63%. Comparing base (096604a) to head (d3a41bf).

Files with missing lines	Patch %	Lines
ecbundle/option.py	54.54%	5 Missing ⚠️
ecbundle/project.py	80.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           populate      #27      +/-   ##
============================================
+ Coverage     38.52%   40.63%   +2.10%     
============================================
  Files            47       48       +1     
  Lines         10023    10113      +90     
============================================
+ Hits           3861     4109     +248     
+ Misses         6162     6004     -158     

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[awnawab]

@wdeconinck could you please review whenever you get the chance? Thanks!