This is the first release of the clips-linux branch.

This branch adds autotools support and includes several other
small changes necessary to compile clips on linux. 

The core CLIPS code is largely unmodified. One particular example
where modification was necessary was in the handling of TTY I/O
where the Linux I/O was handled along with the BSD/UNIX I/O.
However, the BSD/UNIX code used sgtty which is not available in
Linux, so the code hooks to open and close tty's were rewritten
with termios support.