[Qt-creator] make install target available

[Daniel Molkentin]

Hi,

Starting tonight, Qt Creator from git can be installed into arbitrary 
locations. Simply type e.g.

    make INSTALL_ROOT=/usr/local install to install to /usr/local/

You can install to an arbitrary location, because Creator uses a 
relative rpath. Since all libs are purely private to Creator however,
this should not pose a problem.

Packagers: This change is foremost for you. Please report 
successes/problems/wishes back to me.

External Developers: Please take into account that we moved some files 
around (namely resources). Thanks to git however, we had no real merge 
conflicts ourselves. Feel free to report any problems that you encounter 
wrt the changes.

Also note that due to the internal changes there will be no binary 
snapshots tonight.

Cheers,
  Daniel

-- 
Daniel Molkentin, Software Engineer,
Nokia Qt Software, www.qtsoftware.com
Rudower Chaussee 13, DE-12489 Berlin