Update status-bar width to cope with ${point}.
Update status-bar width to cope with ${point}.

The handling of hte status-bar width is off if that text contains
a ${point} string - which expands to the character under the point.

This is because the ${point} might expand to a syngle character
which is made of multiple bytes - we need to fix it up.

This updates #50.

skx/kilua,skx/kilua,skx/kilua,skx/kilua