[Urwid] urwid in pure unicore

[Victor Stinner]

Ooops, urwid-unicode.patch and urwid-unicode-tab2.patch were buggy. I fixed 
the bug and also improve it.

New version (urwid-unicode-v7.patch), better (no more space/tab conflict) and 
*faster*!

New benchmark
   without the patch: 7.8 sec
   with the patch:    2.7 sec

Sorry for the pollution (three emails)...

Finally, the idea is to minimize use of calc_width() => keep widths list in 
Canvas so CanvasCombine can reuse it.

Haypo
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