Import release 0.1.12

[secnet] / TODO

dh.c: change format to binary from decimal string (without introducing
endianness problems)

netlink.c: test the 'allow_route' option properly.

process.c: capture output from children in sys_cmd() and log it

random.c: test properly

resolver.c: ought to return a list of addresses for each address; the
site code ought to remember them and try contacting them in turn.

rsa.c: check padding type, change format to binary from decimal string
(without introducing endianness problems)

site.c: the site_incoming() routing could be implemented much more
cleanly using a table. There's still quite a lot of redundancy in this
file. Abandon key exchanges when a bad packet is received. Modify
protocol to include version fields, as described in the NOTES
file. Implement keepalive mode. Make policy about when to initiate key
exchanges more configurable (how many NAKs / bad reverse-transforms
does it take to prompt a key exchange?)

slip.c: restart userv-ipif to cope with soft routes? Restart it if it
fails in use?

transform.c: separate the transforms into multiple parts, which can
then be combined in the configuration file.  Will allow the user to
plug in different block ciphers, invent an authenticity-only mode,
etc.