maps package updated databases

The latest version, maps_2.2-2 (appearing "soon" on CRAN), has been
enhanced with the state.vbm and state.carto databases (thanks to Simon
Urbanek), and the state.fips, county.fips (both thanks to Clint
Cummins), state.vbm.center and state.carto.center datasets.

Enjoy,
Ray Brownrigg