Various schema updates and comments.
Various schema updates and comments.

* subversion/libsvn_wc/wc-metadata.sql3:
  (NODE): changed_* are now NOT NULL since we always get that information
    from the server. The conflict_* and prop_reject columns are related to
    the WORKING tree, so they have moved into NODE_CHANGES. The
    changelist_id column is also related to WORKING, so it has moved, too.
  (NODE_CHANGES): added a text_modified column to record if we've seen or
    been told about a changed text. The copyfrom_* columns were renamed to
    original_* since they will also record nodes that have been moved.
    Added a text_id column to refer to the base text for a copied/moved
    node, and a boolean to note that a move has occurred (which also
    implies a NODE_CHANGES row on the original file that records a
    deletion and a move). The conflict/reject columns have moved to this
    table, too.

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