added option to write out initial source guess
flushing now performed with sets
added flag for cmfd debug printing
added option to reset dhats
added fix neutron balance option
dhats can be reset from cmfd input
added keff balance
updated documentation and removed some unncessary vars
fixed titles in cmfd section
added capability for more than 2 groups
use zero
fixed using more than 2 groups
switch back to 2g solver
cleaned up code
merged develop into cmfd-additions
removed subroutine to enforce neutron balance
Merge branch 'cmfd-additions' of github.com:bhermanmit/openmc into cmfd-additions
merged develop into cmfd-additions
removed CMFD debugging code
removed balance from users guide