OpenMP implementation of standard D_psi
OpenMP implementation for SSE version of D_psi
OpenMP implementation of deriv_Sb_D_psi
OpenMP implementations of gammaXY()
use more consistent input-output ordering for arguments of inline functions in D_psi
Merge pull request #225 from kostrzewa/forgotten_openmp

OpenMP for D_psi, deriv_Sb_D_Psi and gammaXY