The mainFile property of QmlProject is the default file to run. People
have still the opportunity to override this in their run settings,
though.
The wizard generated code was updated accordingly. Note that this makes
projects generated by the wizard incompatible with QtCreator 2.1!
Task-number: QTCREATORBUG-3249
There are probably very little use cases where you want to start
from a clean environment, and there is no such thing as a Build
Environment (although we magically add some toolchain settings to
the environment).
