Databasing update: Remove all .csv-related functionality

[BvB93]

See nlesc-nano/data-CAT#42:

• Removes the .csv file as a component of the database; everything is now handled via the .hdf5 format.

[codecov]

Codecov Report

Merging #144 into master will decrease coverage by 0.21%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master     #144      +/-   ##
==========================================
- Coverage   65.14%   64.93%   -0.22%     
==========================================
  Files          45       45              
  Lines        3552     3513      -39     
  Branches      598      595       -3     
==========================================
- Hits         2314     2281      -33     
+ Misses       1091     1086       -5     
+ Partials      147      146       -1     

Impacted Files	Coverage Δ
CAT/workflows/key_map.py	100.00% <ø> (ø)
CAT/workflows/workflow_dicts.py	77.14% <0.00%> (ø)
CAT/attachment/qd_opt.py	30.76% <18.18%> (-1.15%)	⬇️
CAT/attachment/perp_surface.py	58.46% <47.36%> (+2.40%)	⬆️
CAT/attachment/edge_distance.py	73.07% <60.00%> (+1.37%)	⬆️
CAT/attachment/ligand_attach.py	69.79% <63.33%> (-1.86%)	⬇️
CAT/workflows/workflow.py	75.59% <70.96%> (-0.58%)	⬇️
CAT/attachment/ligand_opt.py	82.67% <90.00%> (-0.18%)	⬇️
CAT/attachment/distribution.py	91.26% <90.90%> (ø)
CAT/__version__.py	100.00% <100.00%> (ø)
... and 9 more

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