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The BIRD client code is restructured that most of the code (including
main function) is shared in client.c, while birdc.c and birdcl.c contain
just I/O-specific callbacks. This removes all duplicated code from
variant-specific files.

Renames some files:
birdc/client.c -> birdc.c
birdcl/client.c -> birdcl.c
client_common.c -> common.c

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.

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.

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).

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.

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>

Default rounting table for 'show route export/preexport/protocol' is the one related to a respective protocol.

During reconfiguration, iface routes were installed even when iface was down.

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.

They have different behavior w.r.t. filtered routes that are kept.

Router ID could be automatically determined based of subset of
ifaces/addresses specified by 'router id from' option. The patch also
does some minor changes related to router ID reconfiguration.

Thanks to Alexander V. Chernikov for most of the work.

Several new configure command variants:

configure undo - undo last reconfiguration
configure timeout - configure with scheduled undo if not confirmed in timeout
configure confirm - confirm last configuration
configure check - just parse and validate config file

To be consistent with rest of BIRD and Linux. Old names are also
allowed for compatibility.

Although it is a slight deviation from the standard, it has no ill
consequences for OSPFv2 and the change fixes a compatibility issue
with some broken implementations.

When 'import keep rejected' protocol option is activated, routes
rejected by the import filter are kept in the routing table, but they
are hidden and not propagated to other protocols. It is possible to
examine them using 'show route rejected'.