Parallel blast improvements

[necrolyte2]

Still working on fixing up documentation and a few extra tests to ensure things are being called right

[necrolyte2]

@averagehat I think this is good to go for now. Review and merge please

[averagehat]

This is a little cryptic I would mention the need to do diamond view in the docstring, maybe mention what {#} is doing

[necrolyte2]

So I thought I checked the output of the command to make sure the .tsv being produced was correct but apparently I didn't. So i'm back to waiting for diamond to finish so I can verify it's correctness

[necrolyte2]

Alright this seems to work.
Maybe we can build in a more functional test now that I realized how to make a super small diamond database

#. Get a small sequence file in dna format call it smallprotein.dna.fa
#. Translate it to protien call it smallprotein.rna.fa
#. diamond makedb --in smallprotein.rna.fa --db smallprotiendb
#. parallel_blast smallprotien.dna.fa out.tsv --db $PWD/smallprotiendb --blast_exe diamond --task blastx
#. Compare out.tsv to same output from running diamond manually
#. `echo -e "localhost\n127.0.0.1" > nodefile; export PBS_NODEFILE=$PWD/nodefile;``
#. Rerun parallel_blast command above and it should end up with same output

[averagehat]

I'll merge this unless you want to add a functional test.

[necrolyte2]

I think you can merge it. I won't get to the functional tests, but seems like it will be a good idea to add them at some point(minus the parallel portion because I don't know how that would work doing multiple hosts)