Omit versions of rfamseq on Cloud

[kalvari]

The filename of Rfamseq on the EBI cluster always displays the version e.g. rfamseq14_2.fa
To prevent having to update rfam_cloud.conf with every release replace location to latest version of the sequence database with a symbolic link being constant throughout releases.

For example:

Replace path in rfam_cloud.conf from /Rfam/rfamseq/rfamseq14_2.fa to /Rfam/rfamseq/rfamseq.fa

ln -s /path/to/rfamseq/14.2/rfamseq14_2.fa  /Rfam/rfamseq/rfamseq.fa

NOTE: /Rfam/rfamseq/rfamseq.fa needs to be re-indexed using esl-sfetch