Bug 9417 - Allow number of results per page to be selectable for guided reports

Bug 9417 - Allow number of results per page to be selectable for guided reports

This patch adds the ability to select the number of row to show per page while
retaining the default rows per page as 20.

Test Plan:
1) Apply patch
2) Run a guided report that will have many resultant rows
3) Try the various rows per page options
4) Verify the rows per page selected is retained when paging through results

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>