Fix missing documentation for one option.
Implements router advertisements activated by received routes.

The RAdv protocol could be configured to change its behavior based on
availability of routes, e.g., do not announce router lifetime when a
default route is not available.
Fixes handling of iface routes in static proto during reconfiguration.

During reconfiguration, iface routes were installed even when iface was down.
A few semicolons added to decrease a number of warnings.
Route limits can be disabled - this makes sense for protocol templates
Symbol names enclosed by apostrophes can contain DOTs.
Allow submitting BIRD commands from UNIX shell even in restricted mode.
I still believe that 0 == NULL, however this patch will make Santiago happy. :-)
Hotfix to solve an issue with delaying timers reported by Aleksey Chudov.
Use BIRD's ASSERT instead of assert.h
Allow 1 sec RIP update.
Default rounting table for 'show route export/preexport/protocol' is the one related to a respective protocol.
Redundant lines removed.
Small typos fixed.
Rename client/client.c to client_full.c

Rename client/client.c to client-full.c and change the Makefile accordingly.
This is a preparation step for introducing a new lightweight client which
should reuse as much code as possible from the old one but it should not depend
on external libraries.

Signed-off-by: Tomas Hlavacek <tmshlvck@gmail.com>
Pull out independent routines from client_full.c

Pull out routines for interacting with the server and interpreting
internal commands which are not dependent on libreadline and
ncurses libraries.

This is a preparation step for a new lightweight birdc client.
Add lightweight client - birdcl

Restructure client/ subdir. Add two different flavors of client.
The full featured birdc client code is in client/birdc/.
The new light client birtcl is in client/birdcl/.
Common sources of both clients are directly in client/.

Rework on-line auto-completion in client/command.c to conditionally turn off
ncurses-specific code.

Add lightweight client without libreadline and ncurses dependencies - birdcl.
The birdcl lacks support of history, on-line auto-completion and there
are different implementations of "more" functionality and help on '?' press.
New client operates in canonical terminal mode (apart from "more" display)
and therefore all commands have to be executed by a return key including help
commands (called by '?' character in the end of the line).
Apart from these limitations the interaction style should be the same as
for the full client - birdc.
Build of birdcl is always on (independent on --enable-client parameter).
Fix birdcl questionmark handling

Fix handling of questionmark handling in the bird light client. The
questionmark should display help when it is the last non-blank character on
command line. Otherwise the questionmark does not have any special meaning
and it could be a part of a pattern.
Fix birdcl async message handling

Fix handling of async messafe in the bird light client. The async message
may occure at the any moment so we need the client to liste for the
message from server when it waits for user input.
Better handling of global addresses as configured NBMA neighbors in OSPFv3.

Configured NBMA neighbors in OSPFv3 should be link-local addresses, old
behavior was to silently ignore global ones. The patch allows BIRD to
accept global ones, but adds a warning and a documentation notice.

Thanks to Wilco Baan Hofman for the bugreport.