Preparing for building LDA database.

we want to allow filter and similar complex constructs to be used in commands
and we should avoid code duplication), only with CLI_MARKER token prepended
before the whole input.

Defined macro CF_CLI(cmd, args, help) for defining CLI commands in .Y files.
The first argument specifies the command itself, the remaining two arguments
are copied to the help file (er, will be copied after the help file starts
to exist). This macro automatically creates a skeleton rule for the command,
you only need to append arguments as in:

	CF_CLI(STEAL MONEY, <$>, [[Steal <$> US dollars or equivalent in any other currency]]): NUM {
		cli_msg(0, "%d$ stolen", $3);
	} ;

Also don't forget to reset lexer state between inputs.

for processing in next event cycle. This can be used to prevent background
actions (hint: user commands) from hogging the CPU for too long time.

autoconf.h is now written to obj/sysdep, the source tree is hopefully
completely read-only now.

It should be cleaner now, I'm preparing for file splitting.
Maybe I added some minor bugs. :-(

Will we ever able to generate packets saying "route 1.2.3.4 using someone else"?

variables. TODO list added, hopefully complete. Use new features of
filters in bird.conf

after one label, yet.

sending routing table - hopefully).

Next few steps in md5 authentication (not yet complete).