Enhance naming to show that the pubkey is the server's.

While I'm at it, also label the magic constants for prng_seed
to avoid confusion with srand(0).

Got into a situation where telegram would crash upon startup, since fetch_encrypted_message_file would end up being called with a message_media of type CODE_decrypted_message_media_document.

re-added jetbrains .idea/ and netbeans nbproject/ to gitignore

Remove biased shell signs

Not everybody uses bash, you know. Especially the people on *BSD, which you still listed as '$'

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.