Reviewed-by: kh1

We disabled the visible parts of the Qml support by default for the 2.0
release. Defining QTCREATOR_WITH_QML brings it back.

This hack should be removed as soon as 2.0 is shipped.

Reviewed-by: Daniel Molkentin

Users also can now explicitly set the path to the private
header files by passing "QT_PRIVATE_HEADERS=$PATH" to qmake,
or force qmake to ignore the plugins by passing in an invalid
/empty path.

Reviewed-by: con

Always write "Qt Creator" space. Also, make sure lines are
broken at 80 characters.

Reviewed-by: con

Details:  Requested in irc.