Add NO_F2008 alternative to error stop statement.
Add -lmpich.cnkf90 for MACHINE=bluegene.
Move LD_FLAGS before -o in linking step.
Ability to tally flux with individual nuclides (even though it doesn't make sense). Closes #117 on github.
Do not allow user to use surface filter since it's not implemented.
Added analog and implicit absorption estimator of k-effective.
Move printing of k-effective to separate subroutine.
Add/fix two checks for outgoing energy filters. Closes #149 on github.
Remove unused explicit imports.
Fix a few gfortran debug warnings.