Relax GitURL schema: allow no ref - default to master

[kptdobe]

Second run for: #71

This should unlock the backward compatibility.

[ghost]

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[codecov]

Codecov Report

Merging #80 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #80   +/-   ##
=======================================
  Coverage   98.04%   98.04%           
=======================================
  Files          14       14           
  Lines        1022     1022           
  Branches      226      226           
=======================================
  Hits         1002     1002           
  Misses         20       20

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[tripodsan]

-1. we said that refs are mandatory. we should not be backward compatible to a non existing previous version.

[kptdobe]

Ok, I created:

• Remove strains "map" support #81
• Remove ref default "master" from GitURL schemas #82

to follow up on this.

[tripodsan]

actually, I'm not sure about this anymore. I think the reasoning was, since we defined a default via schema, it acts like it would be defined in the config. I think we only said, that we should not have implicit defaults via code.

[tripodsan]

closing as WONT'F FIX see #82