Diald 1.0

Diald manages network links over PPP. It can also be used to manage and/or monitor any network interface.
Diald sets up a "proxy" device which stands in for the physical connection to a remote site. It then monitors the proxy, waiting for packets to arrive. When interesting packets arrive it
will attempt to establish the physical link to the remote site using either SLIP or PPP, and if it succeeds it will forward traffic from the proxy to the physical link. As well, diald will monitor traffic once the physical link is up, and when it has determined that the link is idle, the remote connection is terminated. The criteria for bringing the link up and taking it down are configurable at run time, and are based upon the type of traffic passing over the connection.
Enhancements:
- Use openpty to get a pseudo terminal if it is available.
- Added Makefile rule to build RPMs.
- Changed to use GNU autoconf.
- Added config save/restore to dctrl. Patch from someone but I forget who. If it was you please tell me!
- Handle dynamic changes of netmask.
- Fix check for first packet between firewall.c and filter.c
- Only compile TCP_CORK code if TCP_CORK is defined.