initial utf8 support

Derive a UTF8Terminal class from Terminal that handles utf8 byte
sequences. It only works on Python 3.x, because feed_utf8 relies on
addch handling unicode str objects. The whole utf8 support is also
conditional to Python 3.x, because the locale module was not safe to use
in Python 2.x.

A terminal is considered utf8 if the LC_* or LANG variables indicate
that.

This branch still has known crashes. Writing non-ascii letter at the end
of a line or letting it scroll from one column to another causes
crashes. More problems may hide elsewhere.

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