tabbed: Update to 0.7

0.7
---
- Add Xft support
- Permit to autofocus urgent tabs via Ctrl-Shift-u
- Permit to focus urgent tabs via Ctrl-u
- Add xembed wrapper utility.
  xembed will cause a command to attempt to XEmbed into the window given
  by the environment variable XEMBED, so long as it is in the foreground
  of its controlling terminal. This causes a process to effectively take
  the place of the terminal window, unless it is backgrounded.
- Support urgency WM hints
- Several bug fixes and improvements

(leot)