* install

'cp' can copy recursively, create directories, and even
dereference symlinks.  Everything we have in uapi/ is to be installed.

NOTE we can't use -r for compel includes, as there is some extra stuff
in there we don't want to take with us (in particular, plugins/
and 'compel -> .' symlinks).

* uninstall

rm -rf everything under compel includedir

While at it, fix some minor things here and there.
Reviewed-by: Cyrill Gorcunov <gorcunov@openvz.org>
Reviewed-by: Dmitry Safonov <dsafonov@virtuozzo.com>
Acked-by: Pavel Emelyanov <xemul@virtuozzo.com>
Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>