add initi_mopo to data for evaluation

[dschick]

it is often handy to have the initial motor positions in a scan, init_mopo, also available for calculations in the evaluation within the clist.

This PR adds a routine to automatically add the init_mopo to the scan's data numpy.recarray as scalars for every scan.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.80%. Comparing base (f859310) to head (cca0b86).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #60      +/-   ##
===========================================
+ Coverage    52.24%   52.80%   +0.55%     
===========================================
  Files           10       10              
  Lines         1068     1089      +21     
===========================================
+ Hits           558      575      +17     
- Misses         510      514       +4     

Files with missing lines	Coverage Δ
pyEvalData/evaluation.py	35.22% <100.00%> (ø)
pyEvalData/io/palxfel.py	75.38% <100.00%> (-4.62%)	⬇️
pyEvalData/io/source.py	72.40% <100.00%> (+2.43%)	⬆️

... and 1 file with indirect coverage changes

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