Doc: Document channel debug options

	command-line option.

	<tag><label id="opt-debug-protocols">debug protocols all|off|{ states|routes|filters|interfaces|events|packets [, <m/.../] }</tag>

	Set global defaults of protocol debugging options. See <cf/debug/ in the

	following section. Default: off.

	Set global defaults of protocol debugging options.

	See <ref id="proto-debug" name="debug"> in the following section.

	Default: off.

	<tag><label id="opt-debug-channels">debug channels all|off|{ states|routes|filters|events [, <m/.../] }</tag>

	Set global defaults of channel debugging options.

	See <ref id="channel-debug" name="debug"> in the channel section.

	Default: off.

	<tag><label id="opt-debug-commands">debug commands <m/number/</tag>

	Control logging of client connections (0 for no logging, 1 for logging

	Set protocol debugging options. If asked, each protocol is capable of

	writing trace messages about its work to the log (with category

	<cf/trace/). You can either request printing of <cf/all/ trace messages

	or only of the types selected: <cf/states/ for protocol state changes

	or only of the selected types: <cf/states/ for protocol state changes

	(protocol going up, down, starting, stopping etc.), <cf/routes/ for

	routes exchanged with the routing table, <cf/filters/ for details on

	route filtering, <cf/interfaces/ for interface change events sent to the

	protocol, <cf/events/ for events internal to the protocol and <cf/packets/

	for packets sent and received by the protocol. Default: off.

	route filtering, <cf/interfaces/ for interface change events sent to

	the protocol, <cf/events/ for events internal to the protocol and

	<cf/packets/ for packets sent and received by the protocol. Classes

	<cf/routes/ and <cf/filters/ can be also set per-channel using

	<ref id="channel-debug" name="channel debugging option">) Default: off.

	<tag><label id="proto-mrtdump">mrtdump all|off|{ states|messages [, <m/.../] }</tag>

	Set protocol MRTdump flags. MRTdump is a standard binary format for

inherited from templates can be updated by new definitions.

<descrip>

	<tag><label id="channel-debug">debug all|off|{ states|routes|filters [, <m/.../] }</tag>

	Set channel debugging options. Like in <ref id="proto-debug"

	name="protocol debugging">, channels are capable of writing trace

	messages about its work to the log (with category <cf/trace/). You can

	either request printing of <cf/all/ trace messages or only of the

	selected types: <cf/states/ for channel state changes (channel going up,

	down, feeding, reloading etc.), <cf/routes/ for routes propagated

	through the channel, <cf/filters/ for details on route filtering,

	remaining debug flags are not used in channel debug. Default: off.

	<tag><label id="proto-table">table <m/name/</tag>

	Specify a table to which the channel is connected. Default: the first

	table of given nettype.