don't resample ptable xs if diff temperature but same E
set last prn of a nuclide whenever a prn is needed
Merge remote-tracking branch 'mitcrpgopenmc/develop' into ptable-resample
Merge remote-tracking branch 'mit-crpg/openmc/develop' into ptable-resample
Merge remote-tracking branch 'mit-crpg/openmc/develop' into ptable-resample
Merge remote-tracking branch 'openmc/ptable-resample' into ptable-resample
fixed comment that was over 80 characters
check for void material to avoid out of bounds
removed vestigial check, variable
use linked list to find multiple instances of a single nuclide
Merge remote-tracking branch 'mit-crpg/openmc/develop' into ptable-resample

Conflicts:
	src/cross_section.F90
make the linked list threadprivate
Merge pull request #282 from walshjon/ptable-resample

probability table resample