Improve the error/warning message handling in gempak and gzip jobs (v2.5) (bugzilla #1639)

[DanIredell-NOAA]

http://www2.spa.ncep.noaa.gov/bugzilla/show_bug.cgi?id=1639

New (per v2.5 upgrade) and preexisting bugs collected herein.

Preexisting:
In all preexisting cases the current message does not include ‘FATAL ERROR’ for fatal errors or ‘WARNING’ for non-fatal/warning errors. Please include this language as needed.

• scripts/exrtofs_glo_gzip.sh (gzip_??): echo " $tgzfile was not produced, exiting now."
• scripts/exrtofs_glo_gzip.sh (gzip_??): echo " $file missing, exiting now."
• scripts/exrtofs_glo_gzip.sh (gzip_??): echo " $tgzfile was not produced, exiting now."
• scripts/exrtofs_glo_gzip.sh (gzip_??): echo " $tgzfile was not produced, exiting now."
• scripts/exrtofs_glo_gzip.sh (gzip_??): echo "Cycle not recognized RTOFS GZIP JOB, NO GZIPPED FILES ALERTED"

New:

• scripts/exrtofs_glo_gempak.sh (gempak): wgrib2 call on line 71 fails with unhelpful, undescriptive error message when grib2 files are corrupt. Error message generated by wgrib2 (FATAL ERROR: rd_grib2_msg_seq_file, missing end section ('7777')).