Document the Plan for issue #654:
Document the Plan for issue #654:

* notes/fs-improvements.txt 
  (Switch to a sane node key system): New section.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion