removed CMFD checks on keff and albedos
Moved the setting of estimator to exist for all cases with energyout filters.

Conflicts:
	src/input_xml.F90
Added note about TENDL in documentation.
Fix divide-by-zero when no inactive batches.
Updated release notes for 0.5.2.
Merge branch 'version0.5.2'
Merge branch 'master' into refactor
Normalize direction vector after reflecting particle. Closes #192.
Set blank default for xs listing alias.
Merge branch 'master' into refactor