Implement multi-row delete with new DataTables library in cartable

* Add copyright notices
* Add libraries (jquery, jquery.dataTables)
* Updated the cartable according to:
** http://datatables.net/examples/api/select_row.html
** http://datatables.net/examples/api/select_single_row.html
Logo position CSS tweak
Quick test of data in the table
Adds multiple id removal support in cartable and RemoveEntry servlet
Minor fixes to String constants
Reformatted cartable columns, added isEmpty check
Error page quickfix
Minor CSS and style changes
* Fixed isEmpty check
* Changed table header percentages
* Added stylesheet from DataTables
Renamed mystyle.css to site.css

Fixed all occurrences
Removed unneeded styling and added JS logging
stupid typo
Remade var into full reference
Attempt at rewriting the script using valid DataTable API calls
Using column data now
rows is not a function
typo
Changed logging
Finally fixed idString generation
Updated iframe CSS