* lib/Automake/ChannelDefs.pm: New file.

* lib/Automake/ChannelDefs.pm: New file.
* lib/Automake/Makefile.am (dist_perllib_DATA): Add ChannelDefs.pm.
* automake.in: Move all "register_channel" calls to ChannelDefs.pm.
(prog_error, error, fatal, verb, switch_warning, parse_WARNINGS,
parse_warnings): Move to ChannelDefs.pm.
(usage): Move the warning list to Automake::ChannelDefs::usage
and call it.
(set_strictness): Move channel setings to
Automake::ChannelDefs::set_strictness and call it.