Quick fix in MATPOWER case reading

[jinningwang]

Add unit conversion into mpc2system branch part:
rate_a, rate_b, rate_c: MVA -> p.u.
amax, amin: degree -> rad

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.01% (target: -10.00%)	✅ 100.00% (target: 10.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (47e0798)	11438	5903	51.61%
Head commit (03880ef)	11441 (+3)	5906 (+3)	51.62% (+0.01%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#71)	8	8	100.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.63%. Comparing base (47e0798) to head (03880ef).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #71      +/-   ##
===========================================
+ Coverage    78.62%   78.63%   +0.01%     
===========================================
  Files           58       58              
  Lines         4716     4719       +3     
===========================================
+ Hits          3708     3711       +3     
  Misses        1008     1008              

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