Checkout plone.app.jquerytools and make sure that we use the 1.5.x branch. We need the checkout, otherwise p.a.jquerytools will cause test isolation problems in the plone_app_testing alltests group. We don't want to checkout the master branch because it breaks all robot tests.
Revert "Checkout plone.app.jquerytools and make sure that we use the 1.5.x branch. We need the checkout, otherwise p.a.jquerytools will cause test isolation problems in the plone_app_testing alltests group. We don't want to checkout the master branch because it breaks all robot tests."

This reverts commit a759c42def8aaa874134b2be9aaafcdb88e3e5b9.
Revert "Revert "Checkout plone.app.jquerytools and make sure that we use the 1.5.x branch. We need the checkout, otherwise p.a.jquerytools will cause test isolation problems in the plone_app_testing alltests group. We don't want to checkout the master branch because it breaks all robot tests.""

This reverts commit 08ff190af36d447b93aa6f19b397ad43b1cf3681.