Don't print negative number when dealing with large memory sizes with
sacct.
Same thing as last patch, just for RSS
Make memory types in acct_gather uint64_t to handle systems with more than
4TB of memory on them.
Change parameters to convert_num_unit* to handle larger numbers.
Remove unneeded parameter
Handle reading larger numbers for the file.
Merge remote-tracking branch 'origin/slurm-2.6'

Conflicts:
	src/sacct/print.c