+ class TxCab: added 'm_MapMode' argument
+ added class TxCabMap (default m_MapMode=1)
+ removed implicit append of '&qd=' for TxCab and descendants: now only included if argument URL doesn't end in '=',
to allow more flexible URL specifications
+ added CBiblExpander.(h|cpp): external bibliographic pseudo-fields
- implementation currently just wraps CTermExpander classes (except for Chain)