target_picker: Select study group by default instead of everybody

Signed-off-by: Nicolas Iooss <nicolas.iooss_git@polytechnique.org>
[piX minimodule] fix is_array bug
[News design] images now float:right not to interfere with bullet lists
[TOL] added a pagination at the bottom
[TOL] pagination at the bottom for every design
[TOL] changing page brings back to the top of the list
[Minimodule piX] add link to the author page
Bugfix : templates of minimodules loaded via ajax where not filtered
[Minimodules] add the ability to add and remove minimodules from every page with drag-n-drop & menu selection
Bugfix : quicksearch minimodule called from ajax crashed
[Minimodules] add an refresh via ajax every 2 minutes for compatibles minimodules
[Minimodule xray] add the ajaxRefresh ability
[Minimodule qdj] autorefresh every 2 min
[Minimodules] add the ability to refresh the whole minimodule
[Minimodule news & rer] implements the Ajax Refreshing
Update Changelog with recent commits
[Minimodules] After 2 minutes, 'ajax refresh' waits for the user to move his mouse over the page to refresh

Conflicts:
	ChangeLog
	htdocs/javascript/minimodules.js
[Minimodule Xray] Css update

Conflicts:
	less/default/minimodules/xray_static.less