Also updates the User CSV Upload template generation to use a new DeclarativeSpreadsheetWebScript parent class, which takes care of most of the fiddly bits of generating a spreadsheet (csv, xls, xlsx) with headings based on some data model fields
git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@27992 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261
