oceandataset dictionary style access

[MaceKuailv]

you can do od['salt'] now

[codecov]

Codecov Report

Merging #262 (b2c47b9) into main (647553e) will decrease coverage by 0.02%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##             main     #262      +/-   ##
==========================================
- Coverage   95.54%   95.51%   -0.03%     
==========================================
  Files          10       10              
  Lines        3634     3636       +2     
  Branches      773      773              
==========================================
+ Hits         3472     3473       +1     
- Misses        110      111       +1     
  Partials       52       52              

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unittests	95.51% <50.00%> (-0.03%)	⬇️

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Impacted Files	Coverage Δ
oceanspy/_oceandataset.py	97.36% <50.00%> (-0.23%)	⬇️

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[MaceKuailv]

@Mikejmnez The output of
>>> od[['S','U']]
is this:

<xarray.Dataset>
Dimensions:  (time: 4, Z: 55, Y: 154, X: 207, Xp1: 208)
Coordinates:
  * Z        (Z) float64 -1.0 -3.5 -7.0 -11.5 ... -681.5 -696.5 -711.5 -726.5
  * X        (X) float64 -22.02 -21.98 -21.93 -21.89 ... -13.05 -13.01 -12.96

It works like we intended

[ThomasHaine]

Looks good to me.