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- Added default "javascript_click_handler" (namely ``popup_click_handler``) to
the context via the lizard_map context processor.
- By default, a hover_click_handler isn't added anymore unless you specify one
yourself in the context. Most sites don't need/want it.
- Fixed overly-aggressive reloading of map layers. This improves the performance.
- Added checkboxes and functionality to collage-items (snippets).