BUG: Hide unnecessary PROJ ERROR from proj_crs_get_coordoperation

[snowman2]

• Closes Pyproj logs PROJ_ERROR at debug level #873
• Fully documented, including history.rst for all changes and api/*.rst for new API

[codecov]

Codecov Report

Merging #889 (da06705) into master (0176be6) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #889   +/-   ##
=======================================
  Coverage   95.22%   95.22%           
=======================================
  Files          21       21           
  Lines        1677     1677           
=======================================
  Hits         1597     1597           
  Misses         80       80           

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