automate coding conventions for emacs users
drop autotools-generated files from git

People building from git should be able to run ./bootstrap.sh or just
autoreconf directly.
Add compile-time/run-time configuration of various parameters

Make autoconf variables to set default values for:
        - divert port
        - control port
        - jail dir (chroot)
        - jail user
        - test server

These defaults can be inspected with "tcpcryptd -h"
and overridden at runtime.