Panel title is now the same as grid header. Issue #463
Pass request status to all callback invocations, do not merge changes on error

When saving data on server, the changes should not be merged, if the save
request was not successful.

I have prepared an example at: http://sw-amt.ws/w2ui/demos/#!grid/grid-30
Just edit some fields and click "Save". When an error occurs, the changes are not lost.