Lizard-ui

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- Added error message when next accordion pane fails to load.

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- Added reloadLocalizedGraphs() in addition to reloadGraphs() to reload only
graphs inside a certain div. (Used in lizard-map popups with tabs).

- Added Tipsy (Facebook/Github-style tooltips https://github.com/jaz303/tipsy)

- Added buttons.css (from https://github.com/ubuwaits/css3-buttons)

- Some repeatable backgrounds. (from http://subtlepatterns.com/)

- Some icons from http://glyphicons.com/, added/implemented seperately.
(TODO: integrate properly in sprite.png and the stylesheet of silk)

- OpenLayers 'Dark' theme.

- Re-exported several icon PNG's (meldingen, kaarten) with an alphachannel
drop-shadow.

- Added extra field to ApplicationScreen model. (description, for display in
tipsy tooltips)

- Centered the icons in the 'iphonesque' app-screen.

- Added inset drop-shadows to the app-screen.

- Changed the app-screen font to helvetica-light. (TODO: Try out Google
Webfonts instead)

- Changed gray H2 bars' bevel to a higher contrast, expressing more depth.

- Aligned lizard logo to the outmost left.

- Added tooltips to several interface elements.

- Improved appearance of the breadcrumb. (TODO: position is still a bit
awkward?)

- Changed OpenLayers javascript + css so that the layer chooser's
background color matches the rest of the dark theme.

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- Changed accordion behaviour. All titles are refreshed, but we don't refresh
all pane contents anymore: only the new one. This makes sure trees stay
expanded. And it reduces re-rendering time for big trees. And we
theoretically don't need to send over all the panes' data in case that's
prohibitive for performance.

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- Removed relative positioning on portal-tabs. See ticket 2827.
- Reverted my changes made to .sidebarbox-action-icon in changeset:21174. Even
added 1px extra to better vertically align workspace items. See ticket 2750
for screenshots.
- Added a extra class name for save_form.
- Bigger portal-tabs with rounded corners.
- Corrected text-align of wrong-login.
- "Log in" and "Log uit" links have the same cursor: they were different and
"Log uit" had an illogical one, viz. cursor:text.

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- Fixed vertical location of workspaceitem icons that aren't part of a header.

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- Fixing menubar at 2em height to keep longer content from overflowing the
bar.

- Added favicon image in ``media/lizard_ui/favicon.ico``. So if you want a
different favicon in your project, place an updated icon in your site's
``media/lizardui/`` folder.