added executable flag for cli.sh and gui.sh

git-svn-id: http://gapt.googlecode.com/svn/trunk/source@1440 85d21ef8-add0-11de-ae77-5bfb9c5a3f34
added <, <=, > and => as infix symbol to prover9 parser. david's carrier example now loads

git-svn-id: http://gapt.googlecode.com/svn/trunk/source@1441 85d21ef8-add0-11de-ae77-5bfb9c5a3f34