WIP: setting up gfloat

[tcew]

This sets up a type string associated with the o_ggeo in each mesh. This allows us to change the precision of the o_ggeo array higher up in the code, in particular in elliptic for lower levels in the pMG hierarchy.

[codecov]

Codecov Report

Merging #70 (5c229d8) into master (6a86a46) will decrease coverage by 0.00%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master      #70      +/-   ##
==========================================
- Coverage   84.61%   84.61%   -0.01%     
==========================================
  Files         258      258              
  Lines       20354    20390      +36     
==========================================
+ Hits        17223    17253      +30     
- Misses       3131     3137       +6     

Impacted Files	Coverage Δ
include/mesh.hpp	100.00% <ø> (ø)
libs/mesh/meshOccaSetupTri3D.cpp	0.00% <0.00%> (ø)
solvers/elliptic/src/ellipticOperator.cpp	100.00% <ø> (ø)
solvers/elliptic/src/ellipticPreconMultiGrid.cpp	92.55% <80.76%> (-4.51%)	⬇️
libs/mesh/meshOccaSetupHex3D.cpp	100.00% <100.00%> (ø)
libs/mesh/meshOccaSetupQuad2D.cpp	100.00% <100.00%> (ø)
libs/mesh/meshOccaSetupQuad3D.cpp	100.00% <100.00%> (ø)
libs/mesh/meshOccaSetupTet3D.cpp	100.00% <100.00%> (ø)
libs/mesh/meshOccaSetupTri2D.cpp	100.00% <100.00%> (ø)
solvers/elliptic/src/ellipticSettings.cpp	94.54% <100.00%> (+0.20%)	⬆️
... and 2 more

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