Use stylesheets for all plotting

[rhandberg]

This should avoid loading the package to change global plotting parameters, plus enable some more flexibility in the styling of the generated plots.

[codecov[bot]]

Codecov Report

Merging #38 (d014fe0) into devel (d0d392a) will increase coverage by 0.02%. The diff coverage is 77.52%.

@@            Coverage Diff             @@
##            devel      #38      +/-   ##
==========================================
+ Coverage   84.64%   84.66%   +0.02%     
==========================================
  Files          33       33              
  Lines        4383     4402      +19     
==========================================
+ Hits         3710     3727      +17     
- Misses        673      675       +2     

Impacted Files	Coverage Δ
photometry/AperturePhotometry/k2p2v2.py	71.47% <54.71%> (-0.47%)	:arrow_down:
run_make_todo.py	91.42% <75.00%> (+0.51%)	:arrow_up:
photometry/BasePhotometry.py	93.93% <100.00%> (+0.01%)	:arrow_up:
photometry/halo/halo_photometry.py	79.82% <100.00%> (+0.17%)	:arrow_up:
photometry/plots.py	85.14% <100.00%> (+0.64%)	:arrow_up:
photometry/psf.py	100.00% <100.00%> (ø)
run_ffimovie.py	90.11% <100.00%> (+0.03%)	:arrow_up:
run_prepare_photometry.py	91.42% <100.00%> (+0.51%)	:arrow_up:
run_tessphot.py	88.23% <100.00%> (+0.28%)	:arrow_up:
run_tessphot_mpi.py	94.11% <100.00%> (+0.05%)	:arrow_up:

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