update the perl api to mirror what the slurm.h file looks like now.  Haven't checked to make sure we don't have any more new functions in the api itself we need to look at.

fix bad data type for read call (ssize_t instead of size_t).
fix race condition between setsid and setpgid

    Moab releases until early 2007).

add support for re-sizing

    to task 0 (all other tasks have I/O discarded)