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[IMP-dev] density map volumetrics insertion



Added densityMapVolumetrics{.cpp/.h} files to the IMP::em module
They provide 
  - functions to compute mass/volume of a densityMap at a given threshold
  - functions to compute the threshold one needs to apply in an EM map to attain a given mass/volume
In addition, one can use different protein density values in these computations. 
The default density being used remains 1/1.21 Da/A^3, the value that was used since then.

A small duplication issue remains to leverage :
DensityMap::approximate_molecular_mass() should probably disappear or be remapped on compute_molecular_mass_at_threshold( DensityMap* m, Float threshold);

Shall I do it ?

    --Ben(S)