Followup to r18701. Eliminate unnecessary caching of blockprops in svnmerge.py. Add more documentation on property caching. Fix typo in docstring.
Followup to r18701. Eliminate unnecessary caching of blockprops in
svnmerge.py. Add more documentation on property caching. Fix typo in
docstring.

Suggested by: blair

* contrib/client-side/svnmerge.py
  (blockprops): Remove variable.
  (RevisionLog.__init__): Fix typo in docstring.
  (analyze_revs, main): Don't maintain blockprops dictionary.
  (VersionedProperty): Add documentation.

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