use -fopenmp instead of -openmp for Intel compilers, Intel's mpif90 only reacts to -fopenmp (+ style fixes)
revert change to generaloption, should be done in vsc-base/separate branch
revert back to using -openmp for enabling OpenMP with Intel compilers
minor style fixes
add -mt_mpi to compiler flags when both usempi and openmp toolchain options are enabled
add test case for ictce toolchain, check whether -mt_mpi is used with usempi/openmp toolchain options enabled
improve error message in case Intel FFTW libraries are not found
add mt_mpi without preceding '-' to list of flags
Merge pull request #771 from boegel/fopenmp_intel

enable -mt_mpi compiler flag is both usempi and openmp toolchain options are enabled