Update: Allow `targets` (`aTargets` as it was formally known) to be a
non-array element

- If found to be something other than an array, it will treat it as if
  it were an array with a single element in it, of the value given.
Update: Provide link to technical note explaining errors for DT logged
errors

- A lot of posts in the forum are questions such as "what does the
  invalid JSON response" error mean, or "how to fix the unknown
  requested parameter error". To address these, rather than having them
  answered individually in the forum, I'm going to write a series of
  technical notes for DataTables (getting started, how to use columns
  etc) and as part of those, each error that DataTables can fire off
  will have a technical note explaining in deatil what the error means.

- Example:
   DataTables warning: table id=example - Invalid JSON response. For
   more information about this error, please see
   http://datatables.net/tn/1

- This commit puts the required logic in place. The technical notes
  don't exist yet, but they will soon. They will be:

1 - Invalid JSON response
2 - Non-table node initialisation ({this.nodeName})
3 - Cannot reinitialise DataTable
4 - Requested unknown parameter {param} for row {idx}
5 - Unknown paging action: {action}
6 - Possible column misalignment
		- The table cannot fit into the current element which
		  will cause column

- This also has the advantage that the errors in the DataTables code can
  be a little smaller. Around 500 bytes saved.

- This fixes issue #173