Task: Dependencies are exported as a JSON array

- The 'json.depends.array' setting controls whether dedendencies are encoded as
  a JSON array, or comma-separated string.
- The default value is on.
- Both forms are imported.

doc/man/taskrc.5.in

@@ -401,6 +401,12 @@ array.
 With json.array=off, export writes raw JSON objects to STDOUT, one per line.
 Defaults to on.
 
+.TP
+.B json.depends.array=on
+Determines whether the export command encodes dependencies as an array of string
+UUIDs, or one comma-separated string.
+Defaults to on.
+
 .TP
 .B _forcecolor=no
 Taskwarrior shuts off color automatically when the output is not sent directly