Fix some property types in qbs' qbs project file.

"property path" is wrong for these; they're just strings.

Change-Id: I050b937ee213441a1d19e48a60eef58cfa6b3ba7
Reviewed-by: Jake Petroules <jake.petroules@petroules.com>
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
Fix installation of library in qbs project file.

There were two bugs:
    - For a static build, the library was not installed.
    - For a shared build, the symlinks were not installed.

Change-Id: Ib34b733ca59d6ad27b91663ed0527ed50ef6aa99
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
Store the right build configuration.

The build config we serialized did not contain overridden values.

Change-Id: Ie2841466dc49ad67e7b8f397398533e0e13df207
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>