Set up pfloat to allow amg non-zero entries and dfloat to be different

[tcew]

Defaults to pfloat = double.

Main aim is to reduce storage for SEMFEM.

[codecov]

Codecov Report

Merging #68 (1619a5e) into master (ab76103) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #68   +/-   ##
=======================================
  Coverage   84.08%   84.08%           
=======================================
  Files         257      257           
  Lines       20316    20320    +4     
=======================================
+ Hits        17082    17086    +4     
  Misses       3234     3234           

Impacted Files	Coverage Δ
include/parAlmond/parAlmondparCSR.hpp	100.00% <ø> (ø)
libs/core/platformProperties.cpp	62.16% <100.00%> (+4.58%)	⬆️
libs/parAlmond/parAlmondGalerkinProd.cpp	100.00% <100.00%> (ø)
libs/parAlmond/parAlmondparCSR.cpp	91.03% <100.00%> (ø)

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[noelchalmers]

LGTM