Move printing of k-effective to separate subroutine.
Implemented combined estimator for k-effective.
Consistently order collision, absorption, tracklength.
Simplify permutations in calculate_combined_keff.
Add confidence interval for combined keff estimator.
Moved calculation of combined keff before tally_statistics.
Move calculate_combined_keff to eigenvalue module.
Make sure n_realizations is at least 4 for combined keff calculation.
Added combined estimate of k-effective to state point.
Add/fix two checks for outgoing energy filters. Closes #149 on github.
Remove unused explicit imports.
Fix a few gfortran debug warnings.
Merge branch 'combined'
Added PROFILE=yes cases to test_compile.
Update library directories.
Check for invalid tally filter.
Updated release notes for 0.5.1.
Incremented version number to 0.5.1.
Updated year in output module.
Fixed error in reading state point in parallel.