Use correct number of dimension names in Xspress3ExternalFileReference#175

jmaruland wants to merge 4 commits intoNSLS-II:masterNSLS-II/nslsii:masterfrom

jmaruland:optimize-initialization-of-Xspress3ExternalFileReferencejmaruland/nslsii:optimize-initialization-of-Xspress3ExternalFileReferenceCopy head branch name to clipboard