Get rid of psiblast2fasta

[nromashchenko]

According to HMMER's 3.3.2 guide, it supports FASTA with --outformat AFA. There is no need for psiblast and format juggling. The main reason why this should be done is that psiblast2fasta is quite memory inefficient, and it makes alignment steps in all workflows unrealistically RAM-greedy.