Bug 16337 - Remove the use of "onclick" from the stage MARC records template

Bug 16337 - Remove the use of "onclick" from the stage MARC records template

This patch reviseds the stage MARC records template, removing "onclick"
attributes from the markup and defining those events in the script.

To test, apply the patch and go to Tools -> Stage MARC records for
import.

- Select a MARC file for import.
- Click the "Upload file" button. Your upload should be processed
  correctly.
- Select a MARC file for import.
- Click the "Upload file" button.
- Click the "Cancel" button before the file has been uploaded. The
  upload should be cancelled.

Signed-off-by: Aleisha <aleishaamohia@hotmail.com>

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>