Added check to make sure mu was between -1 and 1 to help with tallying. This will probably result in changes to the tests.
Added check to make sure mu was between -1 and 1 to help with tallying. This will probably result in changes to the tests.

johnnyliu27/openmc,mjlong/openmc,johnnyliu27/openmc,mit-crpg/openmc,liangjg/openmc,johnnyliu27/openmc,kellyrowland/openmc,samuelshaner/openmc,shikhar413/openmc,smharper/openmc,samuelshaner/openmc,mit-crpg/openmc,shikhar413/openmc,bhermanmit/openmc,paulromano/openmc,liangjg/openmc,paulromano/openmc,smharper/openmc,mit-crpg/openmc,liangjg/openmc,liangjg/openmc,samuelshaner/openmc,paulromano/openmc,mit-crpg/openmc,smharper/openmc,samuelshaner/openmc,kellyrowland/openmc,bhermanmit/openmc,walshjon/openmc,walshjon/openmc,paulromano/openmc,walshjon/openmc,shikhar413/openmc,shikhar413/openmc,amandalund/openmc,smharper/openmc,wbinventor/openmc,amandalund/openmc,amandalund/openmc,wbinventor/openmc,wbinventor/openmc,wbinventor/openmc,amandalund/openmc,mjlong/openmc,johnnyliu27/openmc,walshjon/openmc