Merge branch 'release-v4.5'

Merge branch 'release-v4.5'

This merge finalizes the v4.5 release by adding changes from the 'release-v4.5'
branch onto the 'master' branch.

* release-v4.5:
  no need to write GEOPT and SPECHUMD in intermediate file
  Update version number to 4.5
  removal of unnecessary comment in Vtable.ICONm
  add short description about ICON Vtables to README
  add Vtable for ICON for model and pressure levels
  add support for level code 150 (e. g. for ICON-EU data) and automatic detection of the model
  add necessary field names to METGRID.TBL.ARW for ICON-EU
  modify rrpr.F to convert ICON soil moisture from kg m-2 to m3 m-3
  With the merge of PR #216, I think it should now be possible to remove the intermediate name that was less than 9 characters
  Use all 9 characters of namvar when printing field inventory in output() routine
  Increase idlen from 8 to 9 in new_storage.F to support nine-character names
  add global LCZ entry to GEOGRID.TBL
  Add -h/--help options to the 'configure' script
  Improve the calculation of rotation angle at sub-km grid scales
  Adds GFS total column ozone field to metgrid table and creates new Vtable with GFS ozone field.
  Adding entries for MAD-WRF