0.2:

- Surrenders root permissions after processing config file, so encapsulated
packets cannot be used to take over ports < 1024 on the bastion host.  This
may be good for security in general too.

- Refuses to pass encapsulated packets if they refer to a remote-host/port/
local-port triplet which is already in use by another session; this fixes
a bug where one user inside the firewall could intercept packets expected
by another user inside the firewall.

- All local confuration stuff moved out of udprelay.h into Makefile.
