add `uisowidth` attribute to ConstantPeakWidth class

[pavoljuhas]

TODO

• [x] add test that compares with Debye-Waller result from a 2-atom-same-Uiso structure.

[codecov[bot]]

Codecov Report

Merging #16 into master will increase coverage by 0.17%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #16      +/-   ##
==========================================
+ Coverage    87.3%   87.48%   +0.17%     
==========================================
  Files         136      136              
  Lines        7326     7399      +73     
  Branches      533      533              
==========================================
+ Hits         6396     6473      +77     
+ Misses        726      722       -4     
  Partials      204      204

Impacted Files	Coverage Δ
src/diffpy/Attributes.ipp	100% <100%> (ø)	:arrow_up:
src/tests/TestPeakWidthModel.hpp	100% <100%> (ø)	:arrow_up:
src/diffpy/srreal/ConstantPeakWidth.cpp	100% <100%> (+17.39%)	:arrow_up:

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