Lizard-map

------------------

- Removed draggability of workspace-acceptables.

- Made the adapter.extent function optional. In
WorkspaceItem.has_extent we now just detect if the function is at
all present. 3041, 3036.

- Added wms layers to transparency function. 3039.

- Updated googlemaps_api_keys in fixture: the new key is for
lizardsystem.nl and all its subdomains.

- Updated workspace_item_empty: When emptying workspace, the
snippet-groups will also be deleted. 3031.

- Added try/except around search_coordinates and search_name for
3033.

------------------

- Adapter.legend: removed "force_legend_below" behaviour when width <
500. TODO: fix force_legend_below or remove.

- Changed adapter.legend: self.axes.legend instead of
self.figure.legend. Everything seems ok.

------------------

- Added google_tracking_code from settings to context_processor, if
available.

- Added try/except in WorkspaceCollageSnippetGroup.values_table (used
in "show tables" of collage view), because some adapters don't
implement the adapter.values function.

----------------

- Temporary disable sorting in workspace when a new workspace-item is
being added. Solves 2961.

------------------

- Really fixed the non-closed span element.

----------------

- Fixed a non-closed 'span' element that broke the layout in IE.