ensembl_production database.

(gene) DB contains no DNA, script will throw because it won't be able to
check the translation of transcripts later.

Also print gene stable IDs only when they are present.

production database.

Remove old files.

patch identifier too.

#
# Title:
#   Modify the indexes of the object_xref tables.
#
# Description:
# The object_xref_id field of the object_xref table was found to for
# some reason not be a primary key.  This field is always unique, so why
# not add it as the primary key?  Also re-jig the other indexes while we
# are at it.

Michael S.