Cleanup of special PageList column types

Cleanup of special PageList column types
Added support of plugin and theme specific Pagelist Types
Added support for theme specific UserPreferences
Added session support for ip-based throttling
  sql table schema change: ALTER TABLE session ADD sess_ip CHAR(15);
Enhanced postgres schema
Added DB_Session_dba support

git-svn-id: svn://svn.code.sf.net/p/phpwiki/code/trunk@3245 96ab9672-09ca-45d6-a79d-3d69d39ca109