chgres_cube fix to correctly read vertical coordinate type from GRIB2…

… data

Operational RAP GRIB2 files on the native grid (and possibly other GRIB2 data types)
are provided on isobaric coordinates, but contain some data on the 1.0 hybrid 
coordinate.  This fixes an error with chgres_cube proceeding as if all of the data 
were on hybrid coordinates. 

Addresses Issue #222

sorc/chgres_cube.fd/input_data.F90

@@ -2519,7 +2519,7 @@ subroutine read_input_atm_grib2_file(localpet)
  if (.not.lret) call error_handler("OPENING GRIB2 ATM FILE.", iret)
 
  print*,"- READ VERTICAL COORDINATE."
- iret = grb2_inq(the_file,inv_file,":var0_2","_0_0:"," hybrid ")
+ iret = grb2_inq(the_file,inv_file,":var0_2","_0_0:",":10 hybrid level:")
 
  if (iret <= 0) then
    lvl_str = "mb:"