TWEAK: CMakeLists.txt: embed rpath info to avoid LD_LIBRARY_PATH foo
TWEAK: scimath/Functionals/Gaussian2DParam.tcc: precise flux roundtripping

Avoids random assertions about amplitude not being unity.
TWEAK: fix missing includes
TWEAK: ms/MeasurementSets/MSSelector.cc: fix size of weight/sigma when selecting polarizations

Not fully tested!
TWEAK: ms/MeasurementSets/MSSelector.{cc,h}: remove now-unused wantedOne_p member