simpified regex search architecture:

simpified regex search architecture:
  no db specific node methods anymore,
  new sql() method for each node
  parallel to regexp() (which returns pcre)
  regex types bitmasked (op's not yet)
new regex=sql
clarified WikiDB::quote() backend methods:
  ->quote() adds surrounsing quotes
  ->qstr() (new method) assumes strings and adds no quotes! (in contrast to ADODB)
  pear and adodb have now unified quote methods for all generic queries.

git-svn-id: svn://svn.code.sf.net/p/phpwiki/code/trunk@4198 96ab9672-09ca-45d6-a79d-3d69d39ca109