Added two scripts for processing GUPPI search-mode data

Hey Scott.  No sure if these will pass muster, but I hacked together these scripts to divide search-mode data into ~141s filterbank files and update headers so that each file has it's correct RA/DEC.  There isn't any error checking at the moment, but I've processed some 2048 channel and 4096 channel data and it seems to work OK.  Cheers!

-Nate