Geometryless JDBC data store

A new DataStore to handle databases with no native spatial geometry types.

This has now been committed as a plugin called "geomteryless" that currently supports two data stores, complete with factories:

geometryless.JDBCDataStore that knows nothing about geometries and cnabe used to put a WFS (read) interface over any tabular data.

LocationsXYDataStore
Initially restrict to point (location) data with x,y (easting northing, long/lat) columns

This is basically to support geoserver as a front end to the mass of existing location based data not using spatial dbs. Specifically, its also to support work mapping multi-table relational schema to GML application schema standards.

This implementation also supports specification of a ConnectionPool object so you can plug in any back end JDBC source where the driver provides this.

To do:
1) solve limitation that x,y columns need to be last columns in result set
2) allow basic jdbc drivers to be used with a generic connection pool
3) test /implement write access