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
```

author/Anthony_C_Howe.json

@@ -14,11 +14,23 @@
     "github" : null,
     "affiliation" : null,
     "winning_entry_set" : [
-	{ "entry_id" : "1991_ant" },
-	{ "entry_id" : "1992_ant" },
-	{ "entry_id" : "1993_ant" },
-	{ "entry_id" : "2004_hibachi" },
-	{ "entry_id" : "2005_mynx" },
-	{ "entry_id" : "2015_howe" }
+        {
+            "entry_id" : "1991_ant"
+        },
+        {
+            "entry_id" : "1992_ant"
+        },
+        {
+            "entry_id" : "1993_ant"
+        },
+        {
+            "entry_id" : "2004_hibachi"
+        },
+        {
+            "entry_id" : "2005_mynx"
+        },
+        {
+            "entry_id" : "2015_howe"
+        }
     ]
 }