Use WINDOW for the buffer number just like screen.


git-svn-id: svn+ssh://svnrepo/projects/tachyon/trunk@7703 561c3618-0fe6-0310-b5d6-fc65c73fee30
Change tests to use WINDOW instead of TACHYON_BUFNUM


git-svn-id: svn+ssh://svnrepo/projects/tachyon/trunk@7704 561c3618-0fe6-0310-b5d6-fc65c73fee30
Add support for the xterm window title and icon name setting OSC commands.


git-svn-id: svn+ssh://svnrepo/projects/tachyon/trunk@7705 561c3618-0fe6-0310-b5d6-fc65c73fee30