Added Chi and Kappa-fission (k-fission) response types to the input and output structures (but still not the statepoint), and implemented/tested the tallying for kappa-fission.
revised kappa-fission to work as a tracklength estimator (analog can still be accessed if the user wishes), and tested it for micros/macros, etc.
removed some commented out code that was left behind.
Removed the Chi term - making the name of this branch kind of silly. Since it had to be divided by something other than the total weight of particles, it could become messier than the other tallies and since Chi can be obtained by a energy/energyout combo of nu-fission, I will let it go for now.
Changed the tally estimator to be analog if a nu-fission response is requested with outoging energy filters. The previous implementation of using tracklength was incorrect and didn't actually use the outgoing filter.
Updated statepoint.py for the k-fission score.
Merging in the n_nonPn_score_bins to n_user_score_bins change.
Replacing the if-block in the SCORE_SCATTER_PN analog tally case with a cycle SCORE_LOOP, for readability.
Merge branch 'PnInput' into ChiAndKFiss
Merge remote-tracking branch 'upstream/master' into ChiAndKFiss
Added a survival-biasing mode to the kappa-fission analog tally and removed some comments in cross_section.F90 which were no longer necessary.
Updated users guide for kappa-fission tally.
Added kappa-fission as a valid identifier in the input processor.
Added instructions on using JEFF ACE data from NEA.
Updated Windows install instructions.
Added constants.o in OBJECTS.
Updated the users manual to better reflect what kappa-fission specifically was tallying.
Search all coordinate levels for cell filters. Closes #139.
Merge branch 'master' into KappFiss

Conflicts:
	src/constants.F90
	src/tally.F90
	src/utils/statepoint.py
Switched to using kappa-fission to refer to the kappa-fission tally-related quantities instead of just k-fission. Code and Manual are updated to reflect this.