Force profile DB download in system with less than 32 Gygabytes of RAM
On systems with less than 32 Gygabytes of RAM, MMSeqs2 fails to index the PFamA profile database.
The solution is to download the indexed DB and copy it into the appropriate directory.
This solution was also proposed in the issue #54
The proposed enhancement would automatically decide, based on the system RAM, if the profile DB should be indexed in place (the current default behavior) or downloaded from SP2 web-page and installed.