Change WTFPL to MIT (part 3)

Relicense WTFPL media to CC BY-SA 3.0.
Various corrections and edits.

mods/vessels/README.txt

@@ -2,50 +2,18 @@ Minetest Game mod: vessels
 ==========================
 See license.txt for license information.
 
-Crafts
--------
-Glass bottle (yields 10)
+Authors of source code
+----------------------
+Originally by Vanessa Ezekowitz (LGPL 2.1)
+Modified by Perttu Ahola <celeron55@gmail.com> (LGPL 2.1)
+Various Minetest developers and contributors (LGPL 2.1)
 
-   G - G
-   G - G
-   - G -
-
-Drinking Glass (yields 14)
-
-   G - G
-   G - G
-   G G G
-
-Heavy Steel Bottle (yields 5)
-
-   S - S
-   S - S
-   - S -
-
-License of source code:
------------------------
-Copyright (C) 2012 Vanessa Ezekowitz
-Version 2012-09-02
-Modifications by Perttu Ahola <celeron55@gmail.com>
-
-This program is free software; you can redistribute it and/or modify
-it under the terms of the GNU Lesser General Public License as published by
-the Free Software Foundation; either version 2.1 of the License, or
-(at your option) any later version.
-
-http://www.gnu.org/licenses/lgpl-2.1.html
-
-License of media (textures)
+Authors of media (textures)
 ---------------------------
-MIT
+All not listed below, Vanessa Ezekowitz (CC BY-SA 3.0)
 
-Authors of media files
------------------------
-Unless specifically noted,
-Copyright (C) 2012 Vanessa Ezekowitz
-
-The following textures were modified by Thomas-S (CC0 1.0):
+The following textures were modified by Thomas-S (CC BY-SA 3.0):
   vessels_drinking_glass.png
-  vessels_drinking_glass_inv.png (Paramat helped to improve this texture)
+  vessels_drinking_glass_inv.png
   vessels_glass_bottle.png
   vessels_steel_bottle.png

mods/vessels/license.txt

@@ -4,6 +4,7 @@ License of source code
 GNU Lesser General Public License, version 2.1
 Copyright (C) 2012-2016 Vanessa Ezekowitz
 Copyright (C) 2012-2016 celeron55, Perttu Ahola <celeron55@gmail.com>
+Copyright (C) 2012-2016 Various Minetest developers and contributors
 
 This program is free software; you can redistribute it and/or modify it under the terms
 of the GNU Lesser General Public License as published by the Free Software Foundation;
@@ -13,3 +14,39 @@ This program is distributed in the hope that it will be useful, but WITHOUT ANY
 without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 See the GNU Lesser General Public License for more details:
 https://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
+
+
+Licenses of media (textures)
+----------------------------
+
+Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0)
+Copyright (C) 2012-2016 Vanessa Ezekowitz
+Copyright (C) 2016 Thomas-S
+
+You are free to:
+Share — copy and redistribute the material in any medium or format.
+Adapt — remix, transform, and build upon the material for any purpose, even commercially.
+The licensor cannot revoke these freedoms as long as you follow the license terms.
+
+Under the following terms:
+
+Attribution — You must give appropriate credit, provide a link to the license, and
+indicate if changes were made. You may do so in any reasonable manner, but not in any way
+that suggests the licensor endorses you or your use.
+
+ShareAlike — If you remix, transform, or build upon the material, you must distribute
+your contributions under the same license as the original.
+
+No additional restrictions — You may not apply legal terms or technological measures that
+legally restrict others from doing anything the license permits.
+
+Notices:
+
+You do not have to comply with the license for elements of the material in the public
+domain or where your use is permitted by an applicable exception or limitation.
+No warranties are given. The license may not give you all of the permissions necessary
+for your intended use. For example, other rights such as publicity, privacy, or moral
+rights may limit how you use the material.
+
+For more details:
+http://creativecommons.org/licenses/by-sa/3.0/