New methods:

New methods:
  WikiDB::set($key, $val)
  WikiDB::get($key)
To support global meta-data.  Before you make use of these methods,
please consider that they are implemented in a somewhat
hackish manner, and are not likely to be very efficient.

New methods:
  WikiDB::getTimestamp()
  WikiDB::touch()
To support the notion of a global timestamp on the WikiDB.

In WikiDB_Page::set():
  Delete special magic for setting 'pref'.  Currently, this appears to
  be either unused or broken (since 'pref' seems to be set to a
  serialized value.)  In any case, this magic shouldn't be here.
  If you need special handling put it before the call
  to WikiDB_Page::set().

git-svn-id: svn://svn.code.sf.net/p/phpwiki/code/trunk@2568 96ab9672-09ca-45d6-a79d-3d69d39ca109