Initial commit of cleaned up BLAST_makeflow.

This adds blast_makeflow and cat_blast.pl, while updating split_fasta. 
Blast_makeflow is a cleaned and improved version of makeflow_blast with proper argument handling.
Cat_blast.pl uses regex to parse off the end and beginning of results and combine them into a single correct file.
Split_fasta no longer splits FASTA files based on character count, only on query count. @dpandiar