Revamp the tables based on some discussion with hwright.
Revamp the tables based on some discussion with hwright.

* subversion/libsvn_wc/wc-metadata.sql:
  (REPOSITORY, WORKING_COPY, DIRECTORY, PROPERTIES): deleted
  (WCROOT): new table to record multiple wcroots when the metadata is in a
    shared location.
  (NODE): identify by path relative to the wcroot (local_relpath) rather
    than as a directory/filename pair. each node can also specify its
    location in a repository, and that repository's uuid. the working_size
    field can be NULL for directories. add a properties blob.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@875159 13f79535-47bb-0310-9956-ffa450edef68

wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion