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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'.

When there are overlapping IP prefixes and one disappears,
neighbors associated with it was removed even if there
is another covering IP prefix.

Also fixes some minor bugs in include.

Thanks Kelly Cochran for suggestion and draft patch.

Conflicts:

	nest/config.Y
	nest/rt-table.c
	proto/bgp/bgp.c

Adding some files that was accidentally removed
(instead of moved) in cleanup part 2.