added Debian packaging files. Updated Makefile,

$ editor Makefile

Makefile, install in $(DESTDIR)
ex:
        install file $(DESTDIR)etc/profile.d
        install file $(DESTDIR)$(PREFIX)/share/icons
        ...

$ DEBFULLNAME="Luc Pionchon" \
dh_make \
--native \
--indep \
--packagename p-_0.1 \
--email pionchon.luc@gmail.com \
--copyright gpl2

==> creates ./debian/
    with many templates

    WARNING: missing the 'dirs' file
             containing a list of install dirs
             without a leading '/' !

$ git tag version-x.y.z

$ ....
--> create a folder <app>-<version>
                 OR <app>_<version>
    with a CLEAN tree
    (everything will be in the tarball!)

$ cd <app>_<version>

$ dpkg-buildpackage