V1.2 prep

[lognaturel]

Why is this the best possible solution? Were any other approaches considered?

This is a routine update with not much choice. I think this is a good time to remove the repeat warning because the change happened several months ago and it's confusing to folks who didn't build forms before the change. I spent a bit of time seeing if there were any other outdated messages but I can't think of any.

What are the regression risks?

JavaRosa's calculation code was dramatically simplified. The latest release has bee in Collect betas for some time and has gone through careful review so I think the risk to validation behavior is low.

Does this change require updates to documentation? If so, please file an issue here and include the link below.

No.

Before submitting this PR, please make sure you have:

• [N/A] included test cases for core behavior and edge cases in tests_v1
• [x] run nosetests and verified all tests pass
• [x] run black pyxform to format code
• [x] verified that any code or assets from external sources are properly credited in comments

[codecov-commenter]

Codecov Report

Merging #469 into master will decrease coverage by 0.01%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #469      +/-   ##
==========================================
- Coverage   83.55%   83.53%   -0.02%     
==========================================
  Files          25       25              
  Lines        3612     3608       -4     
  Branches      839      838       -1     
==========================================
- Hits         3018     3014       -4     
  Misses        452      452              
  Partials      142      142              

Impacted Files	Coverage Δ
pyxform/xls2json.py	77.89% <ø> (-0.14%)	:arrow_down:

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