Issue #1385772 by swentel: A Christmas present from swentel, allowing drush to export an entire module based upon bulk export with proper directory structures and everything.

Forward port the fixes from 6.x which where mostly done but cleanup extra
lines added to the top of php files and some slight mistakes.

     Conflicts:
         CHANGELOG.txt
         css/modal.css
         ctools.module
         ctools_plugin_example/plugins/access/arg_length.inc
         ctools_plugin_example/plugins/access/example_role.inc
         help/export.html
         includes/ajax.inc
         includes/cleanstring.inc
         includes/content.inc
         includes/content.menu.inc
         includes/context-task-handler.inc
         includes/context.inc
         includes/context.theme.inc
         includes/css.inc
         includes/export.inc
         includes/modal.inc
         includes/object-cache.inc
         includes/plugins.inc
         includes/wizard.inc
         js/ajax-responder.js
         js/collapsible-div.js
         js/dependent.js
         js/dimensions.js
         js/mc.js
         js/modal.js
         page_manager/page_manager.admin.inc
         page_manager/page_manager.module
         page_manager/plugins/tasks/page.inc
         page_manager/plugins/tasks/search.inc
         page_manager/plugins/tasks/user_view.inc
         plugins/access/context_exists.inc
         plugins/access/node_language.inc
         plugins/access/perm.inc
         plugins/access/php.inc
         plugins/access/role.inc
         plugins/access/site_language.inc
         plugins/access/term.inc
         plugins/access/term_vocabulary.inc
         plugins/content_types/block/block.inc
         plugins/content_types/custom/custom.inc
         plugins/content_types/node/node.inc
         plugins/content_types/node_context/node_comment_form.inc
         plugins/content_types/node_context/node_comments.inc
         plugins/content_types/node_context/node_content.inc
         plugins/content_types/page/page_breadcrumb.inc
         plugins/content_types/page/page_footer_message.inc
         plugins/content_types/page/page_help.inc
         plugins/content_types/page/page_messages.inc
         plugins/content_types/page/page_mission.inc
         plugins/content_types/page/page_slogan.inc
         plugins/content_types/page/page_tabs.inc
         plugins/content_types/page/page_title.inc
         plugins/content_types/search/search_result.inc
         plugins/contexts/node_edit_form.inc
         plugins/contexts/term.inc
         plugins/contexts/terms.inc
         plugins/contexts/user.inc
         plugins/relationships/book_parent.inc
         views_content/plugins/content_types/views.inc
         views_content/plugins/content_types/views_panes.inc
         views_content/views_content.module

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.

basics are in place.