Fix problem reading NIDS Storm Track (TDS-506)

For the nested packets, the file pointer wasn't being advanced past
the first one's data. Also improve the error message to indicate a
problem with the packet code, not the product code.
change MIXED_INTERVALS capitalization back to 4.3
fix radar server;
GC: allow direcrory scanning to fail.
Merge remote-tracking branch 'origin/4.5.0' into 4.5.0
grib2 interval filtering
grib2 interval filtering
grib2 interval filtering
added Coverity-Scan files to .gitignore
test git checkin
grib  indexing to tolerate missing directory, io errrors.
Merge remote-tracking branch 'origin/4.5.0' into 4.5.0
try to fix radar server
GribCollection.makeVariableName();
new option grib1 pdsHash: useCenter
replace "+" with "and" in GRIB names.
replace "+" with "plus" in GRIB names.
filter records with unknown time units from ncx2 (ndfd conus 12 (not conduit)), grib2 only.
tolerate these records in Grib2CollectionPanel so we can see them.
GribCdmIndex: tolerate empty directories at the partition level