data housekeeping

- removed naked pointers from Data interfaces
- fixed GH #82: name conflict in Data::Keywords::bind
- fixed GH #157: MySQL: cannot bind to 'long' data type on
Windows/Visual C++
- fixed GH #158: MySQL: MYSQL_BIND 'is_unsigned' member is not set

Data/include/Poco/Data/AbstractPreparator.h

@@ -78,6 +78,8 @@ class Data_API AbstractPreparator: public Poco::RefCountedObject
 	/// after SQL execution (e.g. SQLite) do not need this functionality at all.
 {
 public:
+	typedef SharedPtr<AbstractPreparator> Ptr;
+
 	AbstractPreparator(Poco::UInt32 length = 1u);
 		/// Creates the AbstractPreparator.