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.

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

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.

- php potx-cli.php --mode=multiple
- msgcat views_content-plugins-content_types.pot views_content-plugins-views.pot views_content.pot --use-first --no-wrap -o views_content.combined.pot
- msgcat page_manager-plugins-tasks.pot page_manager-theme.pot page_manager.pot --use-first --no-wrap -o page_manager.combined.pot
- msgcat ctools.pot includes.pot plugins-access.pot plugins-arguments.pot plugins-content_types-block.pot plugins-content_types-custom.pot plugins-content_types-form.pot plugins-content_types-node.pot plugins-content_types-node_context.pot plugins-content_types-node_form.pot plugins-content_types-term_context.pot plugins-content_types-user_context.pot plugins-content_types-vocabulary_context.pot plugins-contexts.pot plugins-relationships.pot --use-first --no-wrap -o ctools.combined.pot