[Development] Cleaner code base patches

[Sune Vuorela]

On 2013-01-28, Knoll Lars <Lars.Knoll at digia.com> wrote:
>>> 1) always with -developer-build
>>> 2) on by default on -developer-build, but the CI disables it
>>> 3) completely optional, CI enables it
>>> 4) completely optional, not enabled by the CI

> I'd favor (2) for now, and move over to (1) once we gained a little experience with it for the compilation of the whole module.
> The header compilation test should probably move to (1) immediately.

Can something in the 'middle' be done where CI somehow yells at 
people who introduces new warnings?

/Sune