Performance testing for fasta-dependent shootouts

Enable performance testing for fasta-dependent shootouts.

Each of these benchmarks takes as input the file generated by the fasta benchmark. They are all given a PREEXEC file that generates the input file sizes needed, and places them in test/tmp. This script will only run during a performance run, and will only generate files if they don't already exist. start_test will attempt to remove the test/tmp folder at the end of its script.
It might even be best for the tests themselves to only create their own input file, but delete tmpFasta if both are present.