COSQLiteStore: tweak docs for revision reading options again, now that I finally understand the expected behaviour :-). Enable disabled parts of TestSQLiteStoreRevisionInfos and add TODO planning how to merge it with TestHistoryInspection. Also, add a FIXME in TestHistoryInspection which points out a small bug in -revisionsForBranch:options: (I think).

git-svn-id: http://svn.gna.org/svn/etoile/trunk/Etoile/Frameworks/CoreObject@10140 7b3f36aa-e6db-49c1-8b4c-66eac1997e64