Active space approaches

[obackhouse]

This PR implements the CCSDt' method, where the T3 amplitudes have all indices in the active space. Hopefully CCSDt with split spaces will be possible down the line.

To do:

• RCCSDt'
• UCCSDt'
• GCCSDt'
• Optimisation
• Fix conversion routines
• Add examples

[codecov-commenter]

Codecov Report

Patch coverage: 96.24% and project coverage change: +0.09 🎉

Comparison is base (7bab745) 99.48% compared to head (882d3f8) 99.58%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #19      +/-   ##
==========================================
+ Coverage   99.48%   99.58%   +0.09%     
==========================================
  Files          51       54       +3     
  Lines       76248    85697    +9449     
  Branches      709      719      +10     
==========================================
+ Hits        75858    85342    +9484     
+ Misses        266      236      -30     
+ Partials      124      119       -5     

Impacted Files	Coverage Δ
ebcc/codegen/RCCSDtp.py	100.00% <ø> (ø)
ebcc/codegen/UCCSDtp.py	100.00% <ø> (ø)
ebcc/util.py	70.89% <48.27%> (-1.02%)	⬇️
ebcc/dump.py	87.12% <72.72%> (-2.35%)	⬇️
ebcc/ansatz.py	80.76% <79.31%> (+16.25%)	⬆️
ebcc/rebcc.py	87.40% <86.82%> (+1.11%)	⬆️
ebcc/space.py	92.78% <89.55%> (+3.69%)	⬆️
ebcc/gebcc.py	94.64% <94.17%> (+3.76%)	⬆️
ebcc/brueckner.py	90.58% <100.00%> (+0.16%)	⬆️
ebcc/codegen/GCCSDtp.py	100.00% <100.00%> (ø)
... and 5 more

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