ProjectDemo: format the undo window labels a bit better

git-svn-id: http://svn.gna.org/svn/etoile/trunk/Etoile/Frameworks/CoreObject@10056 7b3f36aa-e6db-49c1-8b4c-66eac1997e64
ProjectDemo: add branch toolbar to text editor window

git-svn-id: http://svn.gna.org/svn/etoile/trunk/Etoile/Frameworks/CoreObject@10057 7b3f36aa-e6db-49c1-8b4c-66eac1997e64