Add many tests and fix a few bugs

[paulromano]

This PR significantly expands the test suite and should bring our coverage to >70%. As I was putting together tests, I found a few bugs which are also fixed and tested against:

• The X and Y surfaces didn't work when specifying a cone
• The LIKE n BUT syntax was not properly catching MAT and RHO keywords
• Expansion of the nR repeat shortcut only worked when the parameter being repeated was an integer. It now works for numbers in general

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.51%. Comparing base (f3e9b6c) to head (92861f7).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #48       +/-   ##
===========================================
+ Coverage   49.44%   72.51%   +23.06%     
===========================================
  Files           3        3               
  Lines         724      724               
  Branches      190      190               
===========================================
+ Hits          358      525      +167     
+ Misses        314      149      -165     
+ Partials       52       50        -2     

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