Read THERMO variables from TDRP file

[sjsprecious]

This PR:

• adds additional variables for a THERMO run in the beltramiTR.tdrp input file
• enables the SAMURAI code to read in those variables

The values in the TDRP file are set to -1 to make sure that the variables are read in correctly by the program.

Needs to check with Michael about the correct options later.

fix #72

[codecov]

Codecov Report

Attention: Patch coverage is 98.14815% with 3 lines in your changes missing coverage. Please review.

Project coverage is 33.15%. Comparing base (159bb35) to head (7343bf5).

Files	Patch %	Lines
src/VarDriver3D.cpp	25.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #85      +/-   ##
==========================================
+ Coverage   32.49%   33.15%   +0.65%     
==========================================
  Files          51       51              
  Lines       16947    17118     +171     
==========================================
+ Hits         5507     5675     +168     
- Misses      11440    11443       +3     

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[johnmauff]

@sjsprecious Thanks for the code modifications. They look good to me.