external scheduler control of RoolOnly partition (Chris Holmes, HP).

 uninitialized variables (thanks to valgrind).

the plugins themselves. Add new functions to each plugin to return the
error number and given an error number, return a description.

Use it directly from  backfill plugin (instead of API call).

attempt failure (i.e. convert to event driven instead of just polling).
It does still have a 2-second timer to keep the overhead reasonable.

The plugin now gets passed the then current maximum priority to use as a
basis for setting the new job's priority (or not...).

Convert all accessors to use exclusively pointers; this should fix many of the 64-bit incompatibility problems