Extend length of string for reading region specification to 1000
Extend length of string for reading region specification to 1000

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