[maven-release-plugin] prepare release v4.3.18
[maven-release-plugin] prepare for next development iteration
updated overview presentation, added OS generated files to .gitignore
GRIB1: bug in fnmoc level desc; also hardcode in units since they re not in table.
Merge remote-tracking branch 'origin/target-4.3.19' into target-4.3.19
closeOpenFiles() also clears tables
remove old grib classes
move nc2/iosp/grid to visad module