Remove pandas restrictions

[gordonwatts]

• Remove the upper bound on the pandas installation.
• Remove 3.7 testing and support (pandas is no longer around for that release!).

Minor

• Fix up some config options we for vscode that are depreciated.

Fixes #357

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.37%. Comparing base (0f75667) to head (7c134aa).
Report is 4 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #358       +/-   ##
===========================================
+ Coverage   82.23%   98.37%   +16.14%     
===========================================
  Files          40       12       -28     
  Lines        2116     1168      -948     
===========================================
- Hits         1740     1149      -591     
+ Misses        376       19      -357     

Flag	Coverage Δ
unittests	?
unittests-3.10	98.37% <ø> (?)
unittests-3.11	98.37% <ø> (?)
unittests-3.12	98.37% <ø> (?)
unittests-3.8	98.37% <ø> (?)
unittests-3.9	98.37% <ø> (?)

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