forward with the 7.x port!

#596450 by Scott Reynolds: Provide an ajax command response to reset the modal to the loading state.

#589342: Introduce page_manager_get_current_page() to get information about the current page manager page.

 Add cleanstring.inc tool to facilitate more pathauto-like functionality without necessarily using aliasing.

First steps toward updating CTools to d7. This contains some stuff found by coder module, plus css.inc should be fully ported. No testing performed though, so theres probably bugs. Need to write some tests or something.

#545540 by Roger López: Add 5 page elements as available panes for using Panels as your primary page layout: breadcrumb, page title, messages, tabs and help box.