Export - query

- Output from the query command is now optionally surrounded by [ ... ]
  to make this a syntactically correct JSON document.  This is off by
  default.
- Updated documents.

src/Config.cpp

@@ -97,6 +97,7 @@ std::string Config::defaults =
   "xterm.title=no                                 # Sets xterm title for some commands\n"
   "expressions=on                                 # Support for algebraic expressions\n"
   "patterns=on                                    # Support for regex patterns\n"
+  "json.array=off                                 # Enclose JSON output in [ ]\n"
   "\n"
   "# Dates\n"
   "dateformat=m/d/Y                               # Preferred input and display date format\n"