Adjust paths to external executables

[prioux]

In the current state of this repo, many of these scripts have a hard coded paths for external executables, something like

my $MF2FASTA       = "/share/supported/bin/mf2fasta";

We should simply depend on the user's environment to have a proper PATH set up, so these assignments should look like:

my $MF2FASTA       = "mf2fasta";

[prioux]

The old mf2fasta also has this logging statement which we should remove:

system("echo `date +%y-%m-%d,%H:%M:%S` $USER $LoG >>/share/supported/apps/ogmp/log/ogmplog");