save() now takes optional column count

* fix #2493
* save() now takes optional column count, which defaults to highest saved layout otherwise (so we can correctly return back to 12 column when saving in lower res)
* nested grid ALWAYS save to the saved parent container to match
* also changed Utils.removeInternalForSave() to NOT removed w/h=1 optimization as it was causing issues in my app (widget defaults > 1)

Author: adumesny