FA archiver: Revert to original fa-ids.sr file

We won't run parallel versions of this file (new and old formats) because
this will just cause confusion.  Instead I'll track down and fix any
incompatibilities arising from direct use of the file.

git-svn-id: svn+ssh://serv0002.cs.diamond.ac.uk/home/subversion/repos/controls/diamond/trunk/python/fa-archiver@115076 e099a375-04f9-0310-9d5f-a741eaff62e1