updates to subdaily cmorization.

[larsbuntemeyer]

This merge requests updates cmorization routines for subdaily frequencies including point and mean time axis. Time bounds are now computed using cf_xarray.

[codecov-commenter]

Codecov Report

Merging #49 (a92f1b5) into master (89275a4) will increase coverage by 1.17%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master      #49      +/-   ##
==========================================
+ Coverage   38.66%   39.84%   +1.17%     
==========================================
  Files          29       29              
  Lines        1332     1378      +46     
==========================================
+ Hits          515      549      +34     
- Misses        817      829      +12     

Flag	Coverage Δ
unittests	39.84% <66.66%> (+1.17%)	⬆️

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Impacted Files	Coverage Δ
pyremo/cmor/remo_cmor.py	72.68% <66.66%> (+1.17%)	⬆️
pyremo/cmor/utils.py	82.05% <66.66%> (-2.95%)	⬇️
pyremo/core/cal.py	80.48% <0.00%> (-1.10%)	⬇️

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