Do not crash with tenplus1's hopper mod

There are multiple hopper mods and not all of them support the set_extra_container_info function,
so the mod crashes now if it is used together with an incompatible hopper mod.

To prevent the crash, execute the code for hopper compatibility if hopper and hopper.set_extra_container_info exist and not if a mod named hopper is installed.

.luacheckrc

@@ -0,0 +1,2 @@
+read_globals = {"minetest", "table", "vector", "default", "hopper", "pipeworks"}
+globals = {"connected_chests"}

LICENSE.txt

@@ -1 +1,2 @@
-WTFPL
+connected_chest_open from default
+Content which is not copied from minetest_game is licensed under MIT.

README.md

@@ -1,12 +1,12 @@
-[Mod] connected chests [connected_chests]
+[Mod] Connected Chests [connected_chests]
 
-This mod allows making bigger default chests.  
-Just hold shift and place a chest onto another one's side.  
+This mod allows making bigger default chests.<br/>
+Hold shift and place a chest onto another one's side to get a big chest.<br/>
 This is not the first mod which adds big chests.
 
-**Depends:** see [depends.txt](https://raw.githubusercontent.com/HybridDog/connected_chests/master/depends.txt)  
-**License:** see [LICENSE.txt](https://raw.githubusercontent.com/HybridDog/connected_chests/master/LICENSE.txt)  
-**Download:** [zip](https://github.com/HybridDog/connected_chests/archive/master.zip), [tar.gz](https://github.com/HybridDog/connected_chests/tarball/master)  
+**Depends:** see [depends.txt](https://raw.githubusercontent.com/HybridDog/connected_chests/master/depends.txt)<br/>
+**License:** see [LICENSE.txt](https://raw.githubusercontent.com/HybridDog/connected_chests/master/LICENSE.txt)<br/>
+**Download:** [zip](https://github.com/HybridDog/connected_chests/archive/master.zip), [tar.gz](https://github.com/HybridDog/connected_chests/archive/master.tar.gz)
 
 ![I'm a screenshot!](http://wiki.minetest.net/images/d/d1/Connected_chest.png)
 
@@ -15,5 +15,6 @@ If you got ideas or found bugs, please tell them to me.
 [How to install a mod?](http://wiki.minetest.net/Installing_Mods)
 
 
-TODO:  
-— disallow rotating the chest with a screwdriver
+TODO:
+* Fix open big chest back side texture: The current .obj mesh model uses a side
+  texture for the back side, so the model needs change.

depends.txt

@@ -1,3 +0,0 @@
-default
-pipeworks?
-technic?

locale/connected_chests.eo.tr

@@ -0,0 +1,3 @@
+# textdomain: connected_chests
+Big Chest=Kestego
+Big Locked Chest=Ŝlosita kestego

locale/connected_chests.ru.tr

@@ -0,0 +1,3 @@
+# textdomain: connected_chests
+Big Chest=Большой сундук
+Big Locked Chest=Большой запертый сундук

locale/template.txt

@@ -0,0 +1,3 @@
+# textdomain: connected_chests
+Big Chest=
+Big Locked Chest=

mod.conf

@@ -0,0 +1,3 @@
+name = connected_chests
+depends = default
+optional_depends = pipeworks,technic,hopper

models/connected_chest_open.obj

@@ -0,0 +1,79 @@
+# Blender v2.78 (sub 0) OBJ File: 'chest-open.blend'
+# www.blender.org
+o Top_Cube.002_None_Top_Cube.002_None_bottom
+v -0.500000 0.408471 0.720970
+v -0.500000 1.115578 0.013863
+v -0.500000 0.894607 -0.207108
+v -0.500000 0.187501 0.499999
+v 0.500000 1.115578 0.013863
+v 0.500000 0.408471 0.720970
+v 0.500000 0.187501 0.499999
+v 0.500000 0.894607 -0.207108
+v -0.500000 0.187500 -0.500000
+v -0.500000 -0.500000 -0.500000
+v -0.500000 -0.500000 0.500000
+v 0.500000 0.187500 -0.500000
+v 0.500000 -0.500000 0.500000
+v 0.500000 -0.500000 -0.500000
+vt 0.0000 1.0000
+vt 0.0000 0.0000
+vt 1.0000 0.0000
+vt 1.0000 1.0000
+vt 1.0000 0.0000
+vt 1.0000 1.0000
+vt 0.0000 1.0000
+vt 0.0000 0.0000
+vt 0.0000 1.0000
+vt 1.0000 1.0000
+vt 1.0000 0.6875
+vt 0.0000 0.6875
+vt 1.0000 1.0000
+vt 0.0000 0.6875
+vt 1.0000 0.6875
+vt 1.0000 0.6875
+vt 1.0000 0.0000
+vt 0.0000 0.0000
+vt 1.0000 0.6875
+vt 1.0000 0.0000
+vt 1.0000 1.0000
+vt 1.0000 0.6875
+vt 1.0000 0.0000
+vt 0.0000 1.0000
+vt 0.0000 0.6875
+vt 0.0000 0.6875
+vt 0.0000 0.0000
+vt 1.0000 0.5000
+vt 1.0000 1.0000
+vt 0.0000 1.0000
+vt 0.0000 0.5000
+vt 0.0000 0.0000
+vt 1.0000 0.0000
+vn 0.0000 0.7071 0.7071
+vn -0.0000 -1.0000 -0.0000
+vn -1.0000 0.0000 0.0000
+vn 1.0000 0.0000 -0.0000
+vn 0.0000 -0.7071 0.7071
+vn 0.0000 0.0000 1.0000
+vn -0.0000 0.7071 -0.7071
+vn -0.0000 0.0000 -1.0000
+vn -0.0000 -0.7071 -0.7071
+vn -0.0000 1.0000 -0.0000
+g Top_Cube.002_None_Top_Cube.002_None_bottom_Top_Cube.002_None_Top_Cube.002_None_bottom_Top
+s off
+f 6/1/1 5/2/1 2/3/1 1/4/1
+g Top_Cube.002_None_Top_Cube.002_None_bottom_Top_Cube.002_None_Top_Cube.002_None_bottom_Bottom
+f 11/5/2 10/6/2 14/7/2 13/8/2
+g Top_Cube.002_None_Top_Cube.002_None_bottom_Top_Cube.002_None_Top_Cube.002_None_bottom_Right-Left
+f 1/9/3 2/10/3 3/11/3 4/12/3
+f 5/13/4 6/1/4 7/14/4 8/15/4
+f 4/12/3 9/16/3 10/17/3 11/18/3
+f 12/19/4 7/14/4 13/8/4 14/20/4
+g Top_Cube.002_None_Top_Cube.002_None_bottom_Top_Cube.002_None_Top_Cube.002_None_bottom_Back
+f 6/21/5 1/9/5 4/12/5 7/22/5
+f 7/22/6 4/12/6 11/18/6 13/23/6
+g Top_Cube.002_None_Top_Cube.002_None_bottom_Top_Cube.002_None_Top_Cube.002_None_bottom_Front
+f 2/10/7 5/24/7 8/25/7 3/11/7
+f 9/16/8 12/26/8 14/27/8 10/17/8
+g Top_Cube.002_None_Top_Cube.002_None_bottom_Top_Cube.002_None_Top_Cube.002_None_bottom_Inside
+f 4/28/9 3/29/9 8/30/9 7/31/9
+f 7/31/10 12/32/10 9/33/10 4/28/10