Change python2.7 back to python.
guppi_set_params: add vdif thread params, fix packet size.
guppi_utils.py: Small tweak to work with pyfits 3.1
possem: Regenerate interface with current SWIG version on CBE.
guppi_daq_server: start vdif thread in monitor mode, don't use fold mem.
guppi_vdif_thread: use thread IDs from shmem config.