Mg/plot

[mcgarth]

PyRate does not save the zero epoch tscuml_*.tif to disk since it is a zero array and not worth saving. The only way to know the date of the missing zero epoch is to grab it from the geotiff metadata header for linear_rate.tif.

This PR changes the plotting script to grab the time series dates from the linear_rate.tif header. This fixes the zero-epoch issue in the existing script.

Other small changes:

• get the path variable from the command line (remove hard-coded path variable)
• use blue-white-red colour map (for consistency with quick look images)
• make tscuml the consistent naming convention for variables
• plot linear_rate.tif product rather than stack_rate.tif
• use datetime variable for x-axis (rather than ordinal values)

[codecov-commenter]

Codecov Report

Merging #290 into cko will decrease coverage by 0.27%. The diff coverage is 27.77%.

@@            Coverage Diff             @@
##              cko     #290      +/-   ##
==========================================
- Coverage   84.77%   84.50%   -0.28%     
==========================================
  Files          26       26              
  Lines        3396     3413      +17     
  Branches      527      534       +7     
==========================================
+ Hits         2879     2884       +5     
- Misses        417      429      +12     
  Partials      100      100              

Impacted Files	Coverage Δ
pyrate/merge.py	15.38% <0.00%> (-1.18%)	:arrow_down:
pyrate/core/ifgconstants.py	100.00% <100.00%> (ø)

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