update release notes after merging in PR for ARB
Merge branch 'develop' into release_notes_v1.9.0
correct module class for gmacml
bump version to 1.9.0.0, update release notes
fix long lines
fix moar long lines
update easyconfigs count
fix release date for EB v1.9.0
add note on HDF5
Merge pull request #536 from boegel/release_notes_v1.9.0

bump version to 1.9.0.0, update release notes