refactor(tmr.py): ~40% performance improvement for Tmr.get_boundary_f…

[aleaf]

…luxes

• move get_intercell_connections to grid module, and seperate from flow reading so it only has to be done once
• commented out extra intantiation of Interpolator (both x and y fluxes now interpolate to the same grid)
• profiled get_qx_qy_qz; reading the flows from the cell budget file takes up almost all of the execution time, so further reduction would require changes to the flopy binary grid reader
• current configuration took ~45 minutes to get boundary fluxes for the delta model (605 x 270; 21 layers)

[codecov-commenter]

Codecov Report

Merging #46 (2d56ad2) into develop (f8e6d65) will increase coverage by 0.01%.
The diff coverage is 93.27%.

@@             Coverage Diff             @@
##           develop      #46      +/-   ##
===========================================
+ Coverage    89.38%   89.39%   +0.01%     
===========================================
  Files           64       64              
  Lines        11764    11826      +62     
===========================================
+ Hits         10515    10572      +57     
- Misses        1249     1254       +5     

Impacted Files	Coverage Δ
mfsetup/tests/test_tmr.py	95.91% <ø> (ø)
mfsetup/grid.py	87.28% <89.83%> (+0.32%)	⬆️
mfsetup/tmr.py	93.75% <93.10%> (-0.10%)	⬇️
mfsetup/fileio.py	86.34% <100.00%> (+0.10%)	⬆️
mfsetup/tests/test_grid.py	99.04% <100.00%> (+0.08%)	⬆️
mfsetup/tests/test_mf6_shellmound.py	93.38% <100.00%> (+0.03%)	⬆️

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