weight_bbd: new options -last12months
SRTShortcuts: menu entry for weighted bbd of last 12 months
bbbikegooglemap: fixed maptype handling

With v3 the maptype= param was broken. This is fixed now. The old
types like "bbbike_mapnik" are still supported, but new URLs create
new type strings like "BBBike".

v2 compatibility was not really taken care of, and is probably broken
by now.
cgi: beta URL used the non-existing googlemaps maptype "bbbikeorg"

Now "BBBike" is used instead.