float tolerance are interpreted as seconds if coordinate.dtype is datetime64

[atrabattoni]

in open_*, concatenate-like .simplify function methods etc., make the tolerance kwargs accept numeric input for time coordinates. In that case numbers are interpreted as seconds.

• code
• tests
• doc
• release note

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.03%. Comparing base (d81b62f) to head (4993633).
⚠️ Report is 8 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev      #58      +/-   ##
==========================================
+ Coverage   83.01%   83.03%   +0.02%     
==========================================
  Files          43       43              
  Lines        4592     4599       +7     
==========================================
+ Hits         3812     3819       +7     
  Misses        780      780              

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