Rebrand PDB-Dev to PDB-IHM, add support for BMRbig database

[benmwebb]

This should add support for the dictionary changes proposed in ihmwg/IHMCIF#111

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.28%. Comparing base (afb05c0) to head (3516934).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #158   +/-   ##
=======================================
  Coverage   99.28%   99.28%           
=======================================
  Files          33       33           
  Lines        9044     9046    +2     
  Branches     2203     2204    +1     
=======================================
+ Hits         8979     8981    +2     
  Misses         28       28           
  Partials       37       37           

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