This parameter is a directory name. LTR_FINDER can predict protein
domains by calling ps_scan, which can be obtained from
ExPASy-PROSITE (http://www.expasy.org/prosite/). User should place
data file `prosite.dat' and ps_scan in this directory. If this
parameter is enabled, LTR_FINDER will call them and report these
protein domains if they are detected.