outdated blast jobs aren't completely removed.

[cbaakman]

Most likely happens at https://github.com/cmbi/mrs/blob/master/src/M6BlastCache.cpp#L334

Blast jobs that were created on an outdated fasta do get removed from the cache directory, but not from RAM. Thus the files are removed, but not the cache entry in MRS.

This causes MRS to run the same blast job over and over again if requested multiple times.

[cbaakman]

I hope to have fixed this with the following commit:

0135924

though it'll be hard to test it