Use PyOtherSide API version 1.2.

We already have >= 1.2 as a dependency.
Shorten code.
Use a grey daytime street map if available.

https://qt.gitorious.org/qt/qtlocation/commit/3d36599672ab13f8276c9018ddbe4190872796fa
https://qt.gitorious.org/qt/qtlocation/commit/4bdf3bc386d8ace566633ae56505b9875764b16a