define DS manually since needed in Joomla 3.x

"The DS constant has been removed. If you really need it you can use DIRECTORY_SEPARATOR instead. "
http://docs.joomla.org/Potential_backward_compatibility_issues_in_Joomla_3_and_Joomla_Platform_12.2#General_changes
tmpl: rename class to reportsticker, fix module class suffix
create thumbnail images and use them instead of the original ones
version bump to 0.3