Longbow v1.3.0

The changes in this release are summarised below:

1. Fix for recovery file bug where the file name was mangled by
   misplaced comma in os.path.join()

2. Fix for bug where the recovery file was not being recognised from the
   command-line

3. Hydra MPI support was added to the LSF plugin, to get this to work a
   user needs to supply mpiexec.hydra as the handler parameter in
   hosts.conf

4. Some bad file keywords have been removed from the NAMD plugin, more
   files have been added to the list and some corrections to bad case in
   list.

5. Fix for required parameters for staging not being written into the
   recovery file.

6. GROMACS files added to NAMD plugin

7. A disconnect feature has been implemented, users supplying
   --disconnect on the command-line will have Longbow disconnect after
   submitting jobs, these can be reconnected by using the recovery file.

8. Small change to the executable, all code moved from the if name
   == "main": to main() and all code previously in main() moved to
   longbowmain() so unit tests can be made for this part of the
   application.