Lizard-map

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- Various UI fixes and IE7 glitches.

- Fixed 'add to collage' option in workspace view when viewing others'
workspaces. You are not allowed to add snippets in that workspace. 2707.

- Fixed layout problem of animation sliders in block above -r20937 2503 .

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- Fixed timezone bug when comparing dates.

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- Fixed pylint errors.

- Fixed layout of date_popup form for IE7.

- Added css to only show workspace items when you hover it.

- Added 'remove workspace-item' and 'remove snippet' buttons.

- Removed trashcan on bottom of screen. Before the buttons we dragged
items into this trashcan.

- Added titles to various workspace items.

- Added empty-collage.

- NOTE: controls for add and remove workspace items not working on iPad .

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- Fixed jslint error.

- Added base_layer to map_location_save. It now remembers not only the
extent of the view, but also which base layer was selected.

- Removed default controls from OpenLayers map.

- Added slider zoom control to OpenLayers map.

- Made javascript jslint-approved again.

- Disabled auto zoom in lizard_map.js setUpWorkspaceAcceptable().

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- Changed set_ylim_method so that it doesn't crash on axhlims.

- Changed set_ylim_method so that it doesn't crash on no data.

- Changed set_ylim_method so that it autoscales to visible data only.

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- Fixed "Export" and "Voeg toe" in popup with tabs.

- Changed x-axes label formatting. At periods > 10 year, not every
year gets a label anymore.

- Fixed default period. It now takes the period depending on
DEFAULT_PERIOD.