Fixes several bugs related to OSPFv3 vlinks.
Fixes sorting in OSPF show state.
Fixes another bug in OSPFv3 vlinks.
Allows rejected routes to be kept and examined.

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'.
Peer address of stub iface should be announced in OSPF Router LSA.
Fixes OSPF reconfigure w.r.t. downed ifaces.
AS# in bgp.agreggator was a signed integer - fixed.
Changes 'rejected' to 'filtered' in one of the last patches.
Change unnamed ptp link description on OSPFv2.

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.
Updates the documentation.
Fixes route tracing w.r.t. kept filtered routes.
NEWS and version update.
Fixes setting of route attributes of type router id.
Removes some nonsense.
Changes static route targets drop/reject to blackhole/unreachable.

To be consistent with rest of BIRD and Linux. Old names are also
allowed for compatibility.
Implements undo command and optional timeout for configuration

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
Implements interface masks for choosing router id.

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.
Separate import and receive limits.

They have different behavior w.r.t. filtered routes that are kept.
NEWS update.
Merge remote-tracking branch 'remotes/bird/master'

Conflicts:
	conf/conf.c
	nest/config.Y
	nest/proto.c
	proto/ospf/ospf.c
	proto/ospf/ospf.h
	sysdep/unix/config.Y
	sysdep/unix/io.c