'make test' sets libdir to a path in the test sandbox and it propagates
to the mozjs build if it hasn't been built yet. Reinstate a sensible
libdir for mozjs.

Also disable building libmozjs.so and tidy up the mozjs-related make
rules/variables.

Keeping everything js-related under a mozjs directory simplifies the
build and reduces clutter. This also switches building mozjs in a
separate build directory so that the built files can be more easily
ignored. So we now have:

Source:          mozjs/mozjs17.0.0/
Built files:     mozjs/build/
Installed files: mozjs/installroot/

This also adds the --disable-tests configure option.

improving with a tag and proper version numbers later.

Helps to display the event messages

this moves (most of) the mrod and zod commands to the server

over to the new protocol. Should be tranformed into a request to the
server to perform an action, followed by a response and an announcment
of wether the command succeeded.

thus fixing one major dependancy on the who list

Needs work: message head is currently pid of sender, 
      needs to be userposn of sender instead/aswell

Prep work for persistant/replay messaging; Add serial numbers and datestamps to every message processed by the server, fix timestamp printing to use those values instead of wallclock