New version aims to simplify main vault and support deeper merging
strategies.  We'll see...

This is a pretty ugly hack to work around the problem that any attempts
to influence highlight colors in Vim using the `highlight` command were
ignored by Urxvt (not by Xfce4 terminal and few others I tried).

Vim under urxvt does not seem to react to highlight settings, keeping
defaults that under my favorite scheme make Search unreadable and
MatchParen confusing.

The dirty hack is to re-set the colors it happens to use: Yellow and
Cyan.  Ugly, bad, but will work for now.

With transition to tiled window managers, tabbed makes less sense.