Add new port: biology/infernal

Infernal is a tool for searching DNA sequence database for RNA
structure and sequence similarities. The Rfam database of RNA
families is based on Infernal, and we can search DNA sequences for
structural homologs of Rfam families.

WWW: http://eddylab.org/infernal/

PR: 228776
Submitted by: Motomichi Matsuzaki <mzaki@niid.go.jp>