* src/DisplayState.py: Rename from DbState, kepp only DisplayState
class.
* src/GrampsDbBase.py: Add DbState class.
* src/MapView.py: Swap zoom_in and zoom_out to reflect reality;
add place list with the ScrollableWindow, request size for the
place list.
* src/ViewManager.py: Use DisplayState.DisplayState.
* src/gramps_main.py: Use GrampsDbBase.DbState; add docstring;
svn: r5055
* src/MapView.py: New View showing locations on a map. Early unfinished version.
* src/gramps_main.py: Enable MapView
* src/land_shallow_topo_2048.jpg:
* src/land_shallow_topo_350.jpg: Two new map images downloaded from NASA so the are assumed to be public domain.
svn: r5050
