add line_proto_callbacks.on_error, although irc_conn doesn't pass it up

convert line_proto to use a line_proto_callbacks struct

error.c formatting

rework error to use a struct error_desc, and move ERR_SOCK/ERR_GNUTLS definitions to sock.h/sock_gnutls.h. error_desc definitions are still in error.c, though :(

add sock_gnutls_destroy, and error cleanup for sock_ssl_connect. Fix various XXX's

add sock_stream_release/line_proto_release/irc_conn_release functions, and add proper cleanup to irc_net_create

add irc_conn_callbacks, and delay irc_chan_join until on_registered

add irc_chan module

add irc_net module, and fix Makefile CFLAGS, add -Wextra

fix ret/err bug in irc_conn_send, supress unused-argument warnings

add a simple irc_log module (with evsql code) that joins a channel and log_info's PRIVMSGs

add missing irc_cmd.h, and modify line_proto/irc_conn to use log

add basic log.c module

irc_conn PING/PONG code, and line_proto fixups

improve line_proto output buffering slightly

add initial irc_conn code that can register

irc_line implementation

missing break

add some simple command-line options

fix sock_gnutls_read/write EAGAIN

add support for \n line endings as well

update sock_stream_read/write semantics for EOF/EAGAIN, tentative event-based gnutls code

working event-based operation for sock_tcp

fix sock_stream read/write return value, move line buffer inside of line_proto, add some initial code for event-based non-blocking operation

add sock_stream_callbacks and ev_base

split off line_proto, and make sock_stream_error return a const error_info

and then error_msg

add error_name function

ERROR-ify sock_gnutls

change ERROR_* to use pointers again, and implement error_info for sock_init