Add a numeric control ATTR_SET_RADIX

[cmason]

When a user changes a numeric control radix, LabWindows/CVI generates an EVENT_RADIX_CHANGE event and sends the event to the control callback function.

eventData1 = The new format of the radix(VAL_DECIMAL_FORMAT, VAL_HEX_FORMAT, VAL_OCTAL_FORMAT, or VAL_BINARY_FORMAT).  Provide an attribute to set the radix from source code.

[LuisG]

http://forums.ni.com/t5/LabWindows-CVI-Idea-Exchange/Add-a-numeric-control-ATTR-SET-RADIX/idi-p/1851...