o make sendfax recognize "-h <file>" option to set page headers
  started 20.3.93, GD
  new idea: send "AT+FDT", then (optional) page header, then page data.
  (does not work)
  new idea: customized pbmtog3, without EOP.
  "first cut" done, 21.9.93, use "g3cat"
  Suggestion: use "-h <program>", g3cat output of that program with the
  data page (-> headers with real send time)

o make external configuration possible

o add device name to lines in logfile - it gets confusing if separate
  logfiles get printed with "tail -f" to the same terminal, or, if
  separate mgetty processes log into the same logfile

o make a "log_init" function, pass it the log_level, the name of the 
  logfile, additional strings to prepend to each line (e.g. device name)

o faxmail - gatway program for mail -> fax

o when (before) receiving a fax, check if there's enough space left
  (amount configurably)
  generic "get spool file name", check multiple directories
o function for creating spool file names (->dir, prefix; <- name, fd)
  with (optional) sequence numbers

o make faxspool generate title page (if requested). Any PostScript-Expert
  out there?

o modem strings (especially handshake) -> policy.h (-> modemconfig)
  partially done, 22.7.93, gd

o AT+FDCC=x,5 -> configurable
  no (not yet, that is), but add a note to mgetty.texi

o "ringback" - <= 3 RINGs, then silence, then another RING -> take up
  phone

o option for mgetty, to set "MODEM_INIT_STRING"

o make mgetty (and g3cat) add an digifax header to incoming faxes (optionally).

o make +FPTS:2 ignorable...

o tiffg3 -> raw g3 / digifax converter

o library functions for opening / reading g3 files

o Makefile.<system> / AutoConf?

o sendfax: return code for failed polls

o tio - increase abstraction layer even more, make TIO an opaque pointer, so
        that the upper layers do not have to know *anything* about the data
        structure used by tio.c/.h
	(with old/new settings, to avoid surplus system calls)

o additional flag: skip modem initialization and all, go directly to
  reading of login name (for callback)

o faxrunq: lock files, echo "\n" -> echo -i "\n" for bash

o do_chat et. al.: send only "\r"

o fax_notify_mail: include "realname" (from fax phone book) in Subject:

o ln_escape_prompt: \S -> port speed
