added and tested on-the-fly handling of SRE and Disk methods for pseudo-absence selection.  Did some commenting / usage clean-up and also added the --save-R-session-data / --build-sdm-maps options to the wrapper.  These options were previously the default and made debugging and short runs impossible on anything system that didn't have many gigs of memory avaialble.
added and tested on-the-fly handling of SRE and Disk methods for pseudo-absence selection.  Did some commenting / usage clean-up and also added the --save-R-session-data / --build-sdm-maps options to the wrapper.  These options were previously the default and made debugging and short runs impossible on anything system that didn't have many gigs of memory avaialble.