Lizard-map

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- Fixed collage popup.

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- Removed header from standard popup (looks better).

- Added feature to click on workspaces of other users than yourself.

- Improved zoom to layer (it was zoomed in too much).

- Added default settings to MapSettings, improved code a bit.

- Renamed fixture lizard_map to background_maps.

- Added progress animation (zandloper) on delete workspece item(s) by
click on the trash icon and by dragging/draopping the item into
trash.

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- Added migration for BackgroundMap and Setting models.

- Changed "zoom to box" instead of "pan to center" when clicking
workspace-acceptable or workspace-item magnifying glass.

- Added BackgroundMap and Setting models. Model BackgroundMap used to
store the configuration of single background maps and if the map is
the default one. Setting is to store global, end-user changeable
settings, such as startlocation_x, startlocation_y, etc. This change
also removes dependencies of settings.MAP_SETTINGS.

- Added twitter icon.

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- Added support for a second vertical axis in Graph.

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- Turning offset off in adapter using ticker.ScalarFormater.

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- Extended adapter.html_default options with template and
extra_render_kwargs.

- Fixed bug with animation slider. Previously it would not jump to the
correct date/time when start_date is changed.

- Added waterbalance icon.