move grib-clean into grib directory.
Merge branch 'aaa'
Don't create a symbolic link of Makefile. link_grib.csh created a symbolic link of every files in grib.
move grib file download from top level Makefile to the one in grib.
Fix the problem on the end of month. WRFOUT_2400Z became 1st of same month.
find date in each Makefile.
no need to line continuation because you are already in grib.