Fixed the "escape" manipulator so it will work with Null<> wrapped types.  The "quote" manipulator already did the right thing, so copied the way it does things.  Patch by "Kemet" <kemet@telenet.be>
Fixed the "escape" manipulator so it will work with Null<> wrapped
types.  The "quote" manipulator already did the right thing, so copied
the way it does things.  Patch by "Kemet" <kemet@telenet.be>


git-svn-id: 1a57124bbb9aca193a920d0ffd753d488afb922b@2692 5946f024-35f4-0310-b1b3-9a3be3380cfb

veprbl/mysqlpp,veprbl/mysqlpp,veprbl/mysqlpp