Genbank updates

To disable genbank updates to an assembly:

In addition to removing the assembly name from the hgwbeta.dbs and rr.dbs files, the files here need to be removed:

/cluster/data/genbank/data/ftp/

Otherwise the genbank files will keep reappearing.

So, to disable a genome:

   -> remove entries from etc/hgwbeta.dbs and etc/rr.dbs
      please remove them, don't comment them out, cvs keeps
      the history.
   -> cvs update /cluster/data/genbank/etc on hgwdev
   -> cvs update /genbank/etc on hgwbeta
   -> remove /cluster/data/genbank/data/ftp/${assembly} 
   -> remove files on hgdownload