Lots of improvements

[wtbarnes]

There's a lot going on in this PR and is a bit of a grab bag:

• Add col EM method on the whole strand
• Add peek method for strand EM
• Flexible bounds selection for col EM so it's not just over the whole strand
• Clean up background heating stuff that never worked anyway
• Function for generating a stripped down clean copy of HYDRAD
• Fix for configuring gravity and B-field profiles

Fixex #142

[wtbarnes]

This should wait on #144 and then be rebased on top of that.

[codecov[bot]]

Codecov Report

Merging #143 (8304e6e) into master (95f661e) will decrease coverage by 3.15%. The diff coverage is 44.91%.

@@            Coverage Diff             @@
##           master     #143      +/-   ##
==========================================
- Coverage   68.60%   65.44%   -3.16%     
==========================================
  Files           9       10       +1     
  Lines         567      657      +90     
==========================================
+ Hits          389      430      +41     
- Misses        178      227      +49     

Impacted Files	Coverage Δ
pydrad/visualize/plot.py	15.73% <13.63%> (+1.27%)	:arrow_up:
pydrad/configure/configure.py	78.48% <38.46%> (-7.94%)	:arrow_down:
pydrad/configure/util.py	66.66% <46.15%> (-24.25%)	:arrow_down:
pydrad/parse/parse.py	72.04% <63.63%> (-2.45%)	:arrow_down:
pydrad/__init__.py	100.00% <0.00%> (ø)

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