Changed the way the server handle new clients.
New clients now receives the buffer content from an existing
client. Separated initiating a new shared-buffer-session and connecting to
an existing one. Fixed some bugs as well.
Changed the way the server handle new clients. Also added a small time delay
between sending messages to make things run more smoothly.
(sb-kernel:%concatenate-to-string ...) -> (concatenate 'string ...)