Verify checksums when downloading NNDC data. Move ACE files based on new NNDC tgz file.
Verify checksums when downloading NNDC data. Move ACE files based on new NNDC
tgz file.

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