Before, the copy page button linked back to group homepage
instead of copying the page.

This fix changes the button to be a form as in /view/choosetemplate.php

The copied page is placed into the group just like /view/choosetemplate.php
does when inside a group

Bug #800373

Change-Id: I81e94fde8e0dab12bd06c1018b6171a74d6cbe38
Signed-off-by: Hugh Davenport <hugh@catalyst.net.nz>