Add GRand as possible misidentification of gzipped/bgzipped files

This file, created with 'bgzip' misidentifies:

/gscmnt/ams1127/info/model_data/1C9/6A1D0CCBF11E3A4D7FFA12F9A8DCC/output_file.vcf.gz

This bug is suppoed to be fixed in 'File 5.17' but even 14.04 doesn't have that package
yet.