bump version to 1.9.0, update release notes
bump release date
fix release date for EB v1.9.0
Merge pull request #764 from boegel/release_notes

bump version to 1.9.0, update release notes
bump version to v1.10.0dev
Merge pull request #770 from boegel/version_bump

bump version to v1.10.0dev
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
add support for computing and verifying file checksums (supported: adler32, crc32, md5, sha1)
add 'checksums' easyconfig parameter
log MD5 checksum for source and patch files, verify checksum for source and patch files if it's provided
add unit tests for checksum functionality
fix remarks
update vsc-base with support for --confighelp and (unused) bash tab completion support