Committing in a collection of ongoing port work from #589636, so that we can stop trying to track it all in patches.

Will make merging in changes (with an outside dvcs) from the 6--1 branch easier, anyway.

Show a LOCK icon on the page list when pages are locked for editing either by the current user or another user.

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

#592692 by johnskulski: use theme_links instead of theme(links) for dropdown because we do not actually want a theme to change this output.

#564492: by Roger Lopez: Change default class includes from .inc files to .class.php files so they dont get read as plugins.

#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.

Also forgot to merge a todo in last commit.

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.

#552664: Make mc.js not die a horrible death when users have multiple copies of jquery on their site.