restored undocumented way to pass null to setPage to select the first page. Enhanced so that it works in conjunction to maxPerPage.
restored undocumented way to pass null to setPage to select the first page. Enhanced so that it works in conjunction to maxPerPage.

git-svn-id: 7038a89b398528086dab5106cc8d05243a854dbc@9180 ee427ae8-e902-0410-961c-c3ed070cd9f9

theodo/symfony1.1-backports,theodo/symfony1.1-backports,theodo/symfony1.1-backports