MEMBOX - First deployment

Dear Devs,

I've commited the first deployment of membox to CVS.

The goal for this box is to provide a simple yet fast method for MT
injection, and also to provide a bridge to kannel from other languages.

The box waits on a shared memory queue for messages to come in. When
received, it sends the messages to bearerbox. Since messages are being
passed using shared memory, it's _very_ fast.

A model client application is on the "test/" folder. It enqueues 10.000
messages in just a couple of seconds (to smsc "test"). I'm planning to add
some more control to this (control the smsc, from, to and message fields).
At the end, it would be very similar to fakesmsc, but on the client side.

>From a single client test, sometimes the queue get stuck on message #43, and
the only fix is to stop the box, remove the ipc queue (ipcrm -q #id) and
start again. I'm still clueless about what could be causing this, maybe
someone with more IPC experience than me could see where the problem is.

I'm still have to do some concurrency tests (I mean, run two or more
test_send instances at the same time and see if messages are lost/mixed) but
I want first to solve the "message #43 bug".

Anyway, please feel free to jump into the project, make changes and
suggestions.

Best regards,

Alejandro Guerrieri