Catch a lot of old URL's and update them. Also remove a couple of old files
that aren't used.

Fairly major commit. This will break the current version of ihost, but this
had to be done really to give Pete something to test the new ihost against.

The main change here is removal of the TCP Heartbeat functionality from the
filter. This meant the following features stopped working :-
  - Heartbeat testing
  - Configuration checking
  - Service checks

The heartbeat testing, specifically the monitor, now looks at the presence
of UDP packets instead. Before it just looked for the presence of a TCP
heartbeat packet, so the change their is fairly negligible. Of course this
means heartbeat testing now relies on the UDP working... but I don't see
this as a problem.

Configuration checking has been repositioned in to the filtermanager. This
is a backwards compatible change - the filtermanager should still perform
as it should for older hosts. But now there's an extra command to check the
configuration is up-to-date, with a similar format to the old TCP protocol
in the filter. (although we may optimise this soon)

The service checks are broken. This isn't a major issue for us as they were
pretty useless in the first place. The concept is good, but the checks are
just far too primitive. I expect at some point I'll work on a seperate
component that just monitors services, which will replace this function.

Further changes in the server include removal of the key checking code,
as this relied on a bolt on to the TCP heartbeat protocol to ship the
key. This got more akward than originally planned, so I'm happy to drop the
idea. In the long term we hope to replace this with a public key systems
for signing and even encryption.

Finally, general tidy up to remove other bits of code that check for
TCP heartbeat packets when they don't need to any more.

Changed to use the XMLCache.

i-scream is now licensed under the GPL. I've added the GPL headers to every
source file, and put a full copy of the license in the appropriate places.
I think I've covered everything. This is going to be a mad commit ;)

Javadoc'd the whole bally lot.

Modified to use the new style queuing in the local client

Radically changed the way data is passed around. Monitor's are now required to
get data from the MonitorManager queue's, rather than being passed it. This
allows them to run in parallel, rather than the serial setup we had before.

A small change to make the code more proper in creation of strings.

Given all the classes that extend Thread a name using Thread.setName(). It is
only representative as far as it will tell us which class the Thread is, but
this will go some way to aiding debugging. If time permitted, more effort could
be taken to name each thread according to what it was dealing with.

Makefile now compiles the alerter manager.
MonitorManager is now fleshed out.
ClientMain is now fleshed out.

Initial checkin of the class that will construct and manager the Monitor's.