start to migrate DEBIAN rules to distutils

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/branches/maintenance/gramps40@21746 4ae1f11a-8b86-4847-b8af-ab372f36d1fd
add a preinst script for .deb

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/branches/maintenance/gramps40@21747 4ae1f11a-8b86-4847-b8af-ab372f36d1fd
only need next generation of python-gobject (<= 3.0.0) for building

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/branches/maintenance/gramps40@21748 4ae1f11a-8b86-4847-b8af-ab372f36d1fd
slightly better CLI help

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/branches/maintenance/gramps40@21749 4ae1f11a-8b86-4847-b8af-ab372f36d1fd
restore SVN number to "gramps -v" output

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/branches/maintenance/gramps40@21752 4ae1f11a-8b86-4847-b8af-ab372f36d1fd