* The unix group and gid are actuallt part of the group structure, not
  the project. So, when we load a project, load its default group as
  well, and have the routines for the name/gid hand off to the group.

* Change Lookup() to allow either a new idx or an old pid by looking
  at the format of the token. This will make it easier to transition
  to the new order of things.

* Part of the uncommitted uid changes is the addition of head_idx to
  replace head_uid. This code change is okay to commit now, since for
  the time being idx will shadow uid in all tables.

Changed the throughput calculation, cleaned up MaxDelay and
all other files in general to be more readable.

Added checks for out of order ACKs, and error conditions to
check for invalid packets.

sendto() calls block on Linux - verified this on
planet lab - made the writes to UDP socket non-blocking.

compliant with the Version 3 line format, as described in
libnetmon-format3.txt .

Note that I have made a couple small changes to the output format:
Write was renamed Send to be consistent, and I'm allowing Connected
events for UDP sockets, in the case that the application actually does
connect() the UDP socket. I'm not sure what we'd use this information
for, but it seems useful and is easy to ignore.

libnetmon is getting big enough that I should probably spend some time
soon doing code hygiene.

for email changes. Currently, the hash is passed in on the command
line from the web interface, and there is no method for invoking it on
the command line and providing a text password, but that is an easy
change now that the bulk of the code is in the backend instead of the
web interface.

Note that this change took longer cause we allow inactive,frozen, and
wikionly users to change their password, but since they do not have
accounts (yet) the operation is invoked as user "nobody" and tbacct
about to me made aware of that possibility.

Also add equivalent auditing email message that goes to the user when
password is changed.

Also more cleanup and conversion to objects.

address is changed by an admin, but in the process I decided to
implement the entire operation in the backend, since that is what we
want to do anyway for all operations. Email is sent from the backend
script as well.

when no contact info is available. nobody is not an emulab user, so
this field should probably be set to null instead.

is needed more then once a year.

the nodes.

queries taken care of. Also, most of them have moved into group_defs.php.

new uid code, but which is no longer needed now that the login table
has been updated. This was causing a few unlucky people to not be
able to log in.

of dead groups at the bottom from the really early days of emulab.

cookie confusion.

converting to locally unique ids and later globally unique ids.

uid_idx to the uid for compatability with unchanged code.

We use this in the monitor/auto-start script to ensure the monitor is ready
before declaring ourselves done.

the stub) on real plab nodes.