Show information dialogs with jQuery-UI dialog.
Change icons.
1. cross for negation.
2. question for speculation.
3. trash for delete.
4. keyboard for help.
5. i for information.
No operation allowed when redraw.
Bug fix: Values in the setting dialog is not updated when re-open.
Change throwing an error to logging because this is not an error but no operation.
Bug fix: A relation created was not selected.
Bug fix: Modifications are hard to see.