reformat JSON indent with multiples of 4 spaces and no TABs

There is also a fix that fixes a format problem with
the `author_set`.

Used `bn/jfmt-wrapper.sh` to reformat JSON with:

```sh
find * -name '*.json' -print0 | xargs0 -n1 -t bin/jfmt-wrapper.sh
```

2018/hou/input.json

@@ -1,8 +1,26 @@
-[{"brand":"Foo","sales": 1.5 },
-	{"brand":
-		"Bar"
-		,
-		"sales":4.7
-	},  { "sales":2.1, "brand":"Lolz" }
-,  { "sales":0.1, "brand":"Misc" },  { "sales":0.1, "brand":"Misc" },  { "sales":0.1, "brand":"Misc" }
+[
+    {
+        "brand" : "Foo",
+        "sales" : 1.5
+    },
+    {
+        "brand" : "Bar",
+        "sales" : 4.7
+    },
+    {
+        "sales" : 2.1,
+        "brand" : "Lolz"
+    },
+    {
+        "sales" : 0.1,
+        "brand" : "Misc"
+    },
+    {
+        "sales" : 0.1,
+        "brand" : "Misc"
+    },
+    {
+        "sales" : 0.1,
+        "brand" : "Misc"
+    }
 ]