add version 2.0.0
Improve performance of Healthcheck, check if a widget is collapsed and block rendering in this case (ajax call will do the job when opening the widget)
Added faster getTotalSize(). Added safeguard before using slow _getDirectorySize(). #20
Removed back button. #21
Added wrapper_tag to addHeaderRow().
Removed now duplicate check for collapseable state.
Moved collapsed config to widget.
Bumped version to 2.0.2