* the wysiwyg-spawn-api is partly removed (from 2k11/admin/wysiwyg_init.tpl) (TODO: Replace or fix)

* All Javascript-functions like SetCookie now reside in a serendipity-object, simulating a namespace.
    SetCookie(...)
  became
    serendipity.SetCookie(...)

* Renamed JS-Function:
    toggleCategorySelector became toggle_category_selector

* The advanced js option (eyecandy) got removed, as such a thing like advanced js doesn't exist anymore

* dashboard_plugin has an equivalent in the core

* Constants like S9Y_FRAMEWORK_COMPAT are no longer set (include_once is used instead)

* New additional option to render smarty-functions: serendipity_smarty_show($template, $data)

* A number of functions now returns their result instead of echoing them (TODO: a bunch of image- and
trackback-functions still use echo for messages"):
    serendipity_plugin_config
    serendipity_printEntryForm
    serendipity_printEntries
    function serendipity_showMedia
    serendipity_showPropertyForm
    showMediaLibrary
    serendipity_guessInput
    memSnap
    serendipity_displayTopUrlList
    serendipity_displayTopExits
    serendipity_displayTopReferrers
    serendipity_printConfigTemplate
    show_plugins

* Functions removed from the core:
    serendipity_printConfigJS

* All internal plugins got extracted from plugin_internal.inc.php and moved to plugins/.
  They are renamed to work there (TODO: Fix that and rename back or add upgrader task):
    serendipity_calendar_plugin    became serendipity_plugin_calendar
    serendipity_quicksearch_plugin became serendipity_plugin_quicksearch
    serendipity_archives_plugin    became serendipity_plugin_archives
    serendipity_categories_plugin  became serendipity_plugin_categories
    serendipity_syndication_plugin became serendipity_plugin_syndication
    serendipity_superuser_plugin   became serendipity_plugin_superuser
    serendipity_plug_plugin        became serendipity_plugin_plug

* Add plugin hook "js", generating a virtual serendipity.js

* Admin JS is now bundled in serendipity_editor.js.tpl and rendered using smarty in the template config

* Admin JS got rewritten using jQuery where applicable

* serendipity_define.js.php removed

* Removed support for layout.php

* The whole PHP-Code now almost never echoes integrated HTML, but uses smarty template (TODO: Remove the almost)
  The necessary smarty-templates reside in 2k11/admin/
  Every design can generate its own backend if it integrates those templates udner admin/ itself

* 2k11 is set as the new default backend, replacing bulletproof. default remains the fallback so far.

* A number of functions had some arguments removed:
    * function serendipity_displayImageList:
        From
            function serendipity_displayImageList($page = 0, $lineBreak = NULL, $manage = false, $url = NULL, $show_upload = false, $limit_path = NULL, $smarty_display = true)
        to
            function serendipity_displayImageList($page = 0, $lineBreak = NULL, $manage = false, $url = NULL, $show_upload = false, $limit_path = NULL)
    * function serendipity_showMedia
        From
            function serendipity_showMedia(&$file, &$paths, $url = '', $manage = false, $lineBreak = 3, $enclose = true, $smarty_vars = array(), $smarty_display = true)
        to
            function serendipity_showMedia(&$file, &$paths, $url = '', $manage = false, $lineBreak = 3, $enclose = true, $smarty_vars = array())
    * generate_plugins
        From
            static function generate_plugins($side, $tag = '', $negate = false, $class = null, $id = null, $tpl = 'sidebar.tpl')
        to
            static function generate_plugins($side, $negate = false, $class = null, $id = null, $tpl = 'sidebar.tpl')

* serendipity_showMedia now no longer returns the used template and echoes the generated HTML, but only returns the generated HTML

* Designs now have their own configuration page, ?serendipity[adminModule]=templates&serendipity[adminAction]=editConfiguration

* jQuery in the backend no longer runs in noConflict-mode. Use $(...) instead of jQuery(...)

* The entryproperty-plugin will now always delete its cache on uninstall, not only if the cache is activated then

* serendipity_is_iframe now really only checks for iframe and doesn't also echo it