BIG chartbull update

I've just uploaded a BIG update including the following changes:

• better cache handling
• shorter image filenames for registered users
• thumbnail support (also hotlinkable: http://support.yaboard.com/16.html )
• ability to remove chartbull button on exported charts
• dashboard hints and titles
• tested with latest internet explorer (it should not function with latest firefox and internet exploder)
•  rewritten a lot at the back to make things more stable
• hide hints setting
• copy & edit feature, this allows one to copy someone else chart and edit the drawings on it. Handy for discussing charts. Can be disabled if you don't like the idea.
• a lot more :-)