Conflicts:
	.gitignore
	README.md

ignore build-files in .gitignore so git is clean after building

better list of options for -h

Added support to sound notifications

Whitespace cleanups

 * Now BSDs don't require setting environment for configure.
 * No default Makefile any more.

This allows to avoid extra options for BSDs and strangle Linux systems, where
some libraries may be installed under "/usr/local" prefix.

Added command create_group_chat <user> <chat topic>.

Currently it supports only 1 user on creation.
Use chat_add_user to add more users to the chat.

Updated ax_lua.m4 to current version from GNU Autoconf Archive's git
repository with additional patch to support OpenBSD.[1] Regenerated
``configure'' script. DOcumented changes.

---
[1] https://savannah.gnu.org/patch/index.php?8355

Both files are generated by ``configure'' script. Given that they:

  1. may change after running ``configure'' and
  2. are setup-dependent

there's no need to track them anyway.

* files, generated as side-effect of running ``configure'' script,
* files, generated by ``configure'' script (Makefile, config.h),
* ``telegram'' binary.

All these files are setup-dependent and differ between targets.

This feature is new to GCC 4.4, while OpenBSD uses 4.2.1

catch NULL input in interpreter_chat_mode

Added .gitignore file

Update FreeBSD build instruction for linking with lua

Update interface.c to avoid error messages

When hitting enter (without writing anything) in an chat prompt always appears an error message telling you that the message is empty.
Checking the content of the line can avoid this.
I don't know is this behaviour is wrong or right.
So please forgive me if it doesn’t make sense.