Add sse and other math flags to gfortran config
Add sse and other math flags to gfortran config

On AJWT's cygwin, the standard -O3 gfortran 4.9.2 compile
fails the ccmc/np1/Ne-RHF-cc-pVDZ-Lz-CCSDTQ5-multispawn test
owing to it using extended precision, so it rounds (1.d0+) to 2 in
a multispawn ceiling().  This forces gfortran to use double precision
rather than extended precision and the original Markov chain is recovered.

ruthfranklin/hande,hande-qmc/hande,hande-qmc/hande,hande-qmc/hande,hande-qmc/hande,hande-qmc/hande