Prep for patch release v0.9.4

[jinningwang]

• Add Var pi and ExpressionCalc pic to store the dual of constraint power balance
• Add Param M and D to model REGCV1
• Add CPS1 score and AGC mileage in demo_AGC

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ -3.27% (target: -10.00%)	✅ 100.00% (target: 10.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (b45ce49)	10760	5905	54.88%
Head commit (b56a51b)	11438 (+678)	5903 (-2)	51.61% (-3.27%)

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 (#69)	9	9	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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_{You may notice some variations in coverage metrics with the latest Coverage engine update. For more details, visit the documentation}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.62%. Comparing base (b45ce49) to head (b56a51b).

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #69      +/-   ##
==========================================
+ Coverage   78.59%   78.62%   +0.03%     
==========================================
  Files          58       58              
  Lines        4709     4716       +7     
==========================================
+ Hits         3701     3708       +7     
  Misses       1008     1008              

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