mark UNIX scripts as executable


git-svn-id: svn://svn.code.sf.net/p/zenlib/code/ZenLib/trunk@492 f098ebc7-0e84-4588-8ad0-e2271d839f10
gnu/makefile: add missing header at install


git-svn-id: svn://svn.code.sf.net/p/zenlib/code/ZenLib/trunk@493 f098ebc7-0e84-4588-8ad0-e2271d839f10