Subhalo Finder

A parallelized version of Volker's Subfind code:

I'll try to improve documentation, but for now, quick directions:

For use with ntropy, compile the code with the BGC flag set in the Makefile.
Make sure the appropriate simulation units and softening are set in the file subfind.params
Run the command ./P-SubFind.<hostname> with arguments pointing to the snapshot file and group catalog
IDL code for reading in the output files is included. The output files consist of separate files for the position and velocity of each subhalo, as well as a master catalog and a list of particle ID's linking back to the original positions from the fof catalog.