Now we describe up-to-date module progress (if multiple modules are
being built) and consolidate muliple lines of information into just a
couple (for build and install).
This patch does three things:
1-Adds --install-only for the sake of consistency
2-Adds --install into the usage
3-Makes the CMake (KDE4) build system use make install/fast.
make install/fast only performs the installation of the files
thus avoiding a double compilation.
REVIEW: 116589
This can be used as a run-time check later to ensure that kdesrc-build
finds compatible versions of its component modules (though that isn't
done yet).