* Added Constraints template and Add Constraint operator. * Added toggle=True/False parameter to uiItemR, to get a toggle button (actual button) rather than an "option" button (checkbox) * Added OPTION/OPTIONN button type, to distinguish with TOG/TOGN. RNA: * Make all modifier pointers editable, including correct updates. * Added notifiers and updates to constraints. * Fix a stack corruption, pointed out by Andrea, and potentially causing crashes.