docs: Update libcompel

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
devel: Add bare directory for developer resources

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
make: Include Makefile.devel bare file

Will server make devel target

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
make: install-devel -- Generate target dorectory structure

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>