(Position Independent Code) as required on some systems

	(with no reservation). It previously just permitted use of
	avail_node_bitmap, which didn't work properly immediatedly 
	after startup until nodes registerdd.

since it is needed in all of the same places (the job record now
has a pointer to the reservation structure, which has a pointer
to the partition record). Fix some scheduling logic too.

(still need to block jobs not in the reservation from those nodes)

there is more work yet to do, but it's tricky, so i'm committing what works now

system

fix logic for checking if reservations overlap (avoid comparison with self)

for reservations

add logic to authenicate a job's access to a reservation at submit time based upon account and user_id only
(not association)

    the "create" option rather than "update" (which will only operate
    upon partitions that already exist).

Still under development
svn m_e_r_g_e -r16224:16292 https://eris.llnl.gov/svn/slurm/branches/slurm-1.4.resv