DCD and DCSD

[obackhouse]

Adds distinguishable cluster methods:

• RDCD
• UDCD
• RDCSD
• UDCSD

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (60ca8e6) 99.56% compared to head (673b335) 99.56%.
Report is 9 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master      #33     +/-   ##
=========================================
  Coverage   99.56%   99.56%             
=========================================
  Files          54       58      +4     
  Lines       85708    87092   +1384     
  Branches      817      821      +4     
=========================================
+ Hits        85333    86713   +1380     
  Misses        249      249             
- Partials      126      130      +4     

Files	Coverage Δ
ebcc/__init__.py	98.73% <100.00%> (ø)
ebcc/ansatz.py	80.58% <100.00%> (ø)
ebcc/codegen/RDCD.py	100.00% <100.00%> (ø)
ebcc/codegen/RDCSD.py	100.00% <100.00%> (ø)
ebcc/codegen/UDCD.py	100.00% <100.00%> (ø)
ebcc/codegen/UDCSD.py	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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