mapfileparser - imagemodes typo (ORG -> OGR)
KeyValueModel / Mapsettings - Add extra filter

Some key/values should not be displayed on the views, because managed
by other widgets.
mainwindow - preview / ui changes

resize/redraw: using the available space, no scrollbars.
mainwindow - map options

Zoom +, - and pan are two-state buttons. Wiring behaviour consequently.