Fix sum to1 state

[joefresna]

Fix #317 #318

[codecov-io]

Codecov Report

Merging #354 into master will increase coverage by 0.1%.
The diff coverage is 52.23%.

@@            Coverage Diff            @@
##           master     #354     +/-   ##
=========================================
+ Coverage   68.98%   69.08%   +0.1%     
=========================================
  Files           9        9             
  Lines        5774     5780      +6     
  Branches     1576     1583      +7     
=========================================
+ Hits         3983     3993     +10     
+ Misses       1397     1389      -8     
- Partials      394      398      +4

Impacted Files	Coverage Δ
mumot/views.py	66.23% <0%> (+0.03%)	⬆️
mumot/controllers.py	78.05% <0%> (-0.15%)	⬇️
mumot/utils.py	69.93% <54.16%> (+2.22%)	⬆️
mumot/models.py	71.96% <64.28%> (-0.11%)	⬇️

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[jarmarshall]

I've forced all proportions to sum to 1 for now as the distinction between views is not clear to me in this regard; the logic is there for relaxing the sum rule though and can be applied in the future if deemed useful.
I've also implemented warnings properly, via warn()... this should be non-blocking