Update META for 2.6.7 tag
update for potential next 2.6
Add support for Torque/PBS job arrays

Add support for job array options in the qsub command, in #PBS
options for sbatch scripts and set the appropriate environment
variables in the spank_pbs plugin (PBS_ARRAY_ID and PBS_ARRAY_INDEX).
Note that Torque uses the "-t" option and PBS Pro uses the "-J"
option.
Update qsub help for job arrays
Merge branch 'slurm-2.6'

Conflicts:
	META
	NEWS