examples subpackage and the html documentation (which is now being
installed) into an html subpackage
- cleanup install target a bit
- make use of a few variables to specify paths for installation, QT_INCDIR,
QT_LIBDIR, QT_MANDIR, QT_EXAMPLES, QT_TUTORIAL and QT_DOC
- man pages have moved from PREFIX/man to PREFIX/lib/qt/man to stay
consistant with the qt2 port