Currently we require the current version, 1.6.0, and as soon as 1.6.1 is out,
I will start requiring that, because I want to use a feature I submitted to
it.
Surround most of configure.ac with AC_LANG_PUSH([C++]) while at it, as this is
all C++ code anyway.
For now, each LOOL client has a separate child process (or none at all, if it
has accessed only information found in the cache). This will obviously have to
chnage to handle collaboration. Etc.
The parent process talks the same Websocket protocol with the child
processes. When there is a child process for a client, traffic from the client
is forwarded as such to the child process and vice versa.
