fix search by date using datetimepicker
corection 1771
Set LAYER_PREVIEW_LIBRARY = 'geoext' as default, refs #1528

Also adds a placeholder for that setting in the debian package local_settings.py
Leaflet cannot be enabled as default until there is a sane way to edit styles.
Updated changelog for version 2.4a31
put last modification on less file
Merge pull request #1772 from Geode/mete_page_css

corection 1771
Added a request download button in layer and document detail pages. The request will be sent to resource owner using django-notification
Making flake8 happy. Using get_object_or_404 for getting the resource
Refactored the RESOURCE_PUBLISHING setting, now it is not activated by default
initial levels support
Fix minor typo in comment
update integrations tests for resource publishing
Merge pull request #1778 from capooti/request-permission

Request Download
Merge pull request #1794 from state-hiu/levels

Announcement Types/Levels - Initial
update base.css
bump announcements version
Updated changelog for version 2.4a32
Fix paneltbar margin in maps page
Fix geoexplorer body font
Merge pull request #1796 from ppasq/fixer

Fix 2 minor style issues in geoexplorer map page