Bug 12519 - Convert OPAC list download pop-up to modal dialog

This patch changes the OPAC list download process so that the download
link triggers a modal dialog instead of a pop-up window. This
streamlines the process a little bit and makes it work better on mobile
devices.

The download list page has been altered so that it works better as a
standalone page, as it might be seen if JavaScript is disabled. Simple
form validation has been added to help prevent submission of the form
without choosing a format.

To test the virtualshelves system preference must be enabled.

- View an existing list in the OPAC and click the "download list" link.
- A modal dialog should be displayed with the download form.
- Submitting the form without selecting a format should trigger either a
  browser-based form validation error (in HTML5-supporting browsers) or
  a JavaScript alert (if your browser doesn't support the "required"
  attribute.
- Choosing a download format and submitting the form should close
  the dialog and trigger the correct download.
- Clicking the "Cancel" link should close the dialog.

Test with JavaScript disabled:

- Clicking the "download list" link should take you to a page which
  contains the same form which appeared in the modal dialog.
- Submitting the form without selecting a format should trigger either a
  browser-based form validation error (in HTML5-supporting browsers) or
  a JavaScript alert (if your browser doesn't support the "required"
  attribute..
- Choosing a download format and submitting the form should result in
  the corect download.
- Clicking the "Cancel" link should return you to the correct list.

Signed-off-by: Aleisha <aleishaamohia@hotmail.com>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Passes QA script and tests, works as described.

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Bug 11347 - PROG/CCSR deprecation: Remove opacsmallimage system-preference

The opacsmallimage system preference is unused in the bootstrap theme.
It can be removed now that prog and ccsr are deprecated. This patch does
so.

To test, apply the patch and run updatedatabase. Confirm that the OPAC
works properly and the preference can no longer be found.

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
Preference removed, no koha-qa errors

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>