Prep for v0.9.12

[jinningwang]

• Refactor OModel.initialized as a property method
• Add a demo to show using Constraint.e for debugging
• Fix ams.opt.omodel.Param.evaluate when its value is a number
• Improve ams.opt.omodel.ExpressionCalc for better performance
• Refactor module ams.opt
• Add class ams.opt.Expression
• Switch from PYPOWER to ANDES in routine PFlow
• Switch from PYPOWER to regular formulation in routine DCPF
• Refactor routines DCPF and DCOPF
• In RDocumenter, set Srouce to be owner if there is no src
• Specify multiprocess<=0.70.16 in requirements as 0.70.17 does not support Linux

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ -3.11% (target: -10.00%)	✅ 78.41% (target: 0.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (45fb420)	12421	7389	59.49%
Head commit (1fec2ef)	13565 (+1144)	7647 (+258)	56.37% (-3.11%)

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 (#101)	1135	890	78.41%

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

Attention: Patch coverage is 76.93762% with 244 lines in your changes missing coverage. Please review.

Project coverage is 79.11%. Comparing base (45fb420) to head (1fec2ef).
Report is 116 commits behind head on master.

Files with missing lines	Patch %	Lines
ams/opt/expression.py	62.36%	35 Missing ⚠️
ams/opt/omodel.py	62.06%	33 Missing ⚠️
ams/opt/exprcalc.py	62.66%	28 Missing ⚠️
ams/routines/dcpf0.py	75.55%	22 Missing ⚠️
ams/opt/var.py	79.41%	21 Missing ⚠️
ams/opt/constraint.py	78.48%	17 Missing ⚠️
ams/opt/objective.py	80.82%	14 Missing ⚠️
ams/opt/optbase.py	79.10%	14 Missing ⚠️
ams/routines/dcpf.py	77.41%	14 Missing ⚠️
ams/routines/pflow0.py	62.85%	13 Missing ⚠️
... and 6 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #101      +/-   ##
==========================================
+ Coverage   78.20%   79.11%   +0.91%     
==========================================
  Files          61       70       +9     
  Lines        5510     5913     +403     
==========================================
+ Hits         4309     4678     +369     
- Misses       1201     1235      +34     

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