changed credential.signature from a uint32_t to char[16]  128 signed sha1

job_script is no longer a member of the job_rec struct

Added read/write data structure locks for all RPCs.

on slurm error. Parsing error prints message right away and returns zero.

Restructure some slurmctld code for easier semaphore use.

still having problems with the verify

script and environment go to file.

The uid must be a valid uid on the machine where the test is being run

fixed big/little endian problem

   (mostly taken from openssh)

General API code clean-up.