Support extra fields at the attribute-level; fix escaping on toString; allow sorting of extra fields and selection options
This commit adds the sorting controls to the options (NOT attribute level)
The "nowrap" in the style attribute fix the break problem in Firefox Linux on the sorting controls
The Delete button has been moved to the far right
Make the column to use all the space in the row so the options doesn't get break.
Remove duplicate JavaScript event; support sorting of multiple attributes on the same class
Merge branches 'extra-fields-attribute-level' and 'master'