Don't delete the GeneGC entry from attrib_type, since if it is deleted it will be re-created later in the script with a different attrib_type_id, which will be inconsistent with that in the attrib_type.txt file.

additional option-names added -dbhost -dbuser -dbname -dbport ...

Now use API rather than direct SQL. Creates a transcript attribute for each frameshift intron, the value of the attribute being the number of the intron in the transcript, starting from 1.

Also delete existing frameshift attributes by default.

Add join with seq_region to allow output of chromosome name when -locations option is used. Seems to slow things down, so could be removed again if -locations is removed in future.

Changed dbname arg to dbpattern, to allow for use of regular expressions to specify a number of databases to run on sequentially.

Finds frameshifts (modelled as introns of length 1,2,4 or 5 bp) and adds transcript attributes (code 'Frameshift') for them.