Update acct_gather.conf docs about options and plugins
Note about acct_gather.conf file and non loaded plugins
Node issues of MPI launched tasks with accounting and task binding
Minor tweaks for poe tests

Need higher memory limits due to pmdv12 size
pmdv12 fails to recognize immediate application exit, hangs with defunct process
Merge branch 'slurm-2.6'

Conflicts:
	testsuite/expect/test1.33