Reconfigure API now working.

Otherwise print first nodes, last nodes, and a few in between.

a few cleanups in job_info and build_info

buffers that are pre-build by slurmctl, using the old inline pack, and for this reason
did not use the assert checked functions

node info conversion

comm layer

fixed a few bugs with node info and reconfigure

Minor cleanup (i.e. comments) on other APIs.

   in quite awhile.

 o added section glossing over job initiation design and corresponding
   figures.