[revOnline] AllowedChars Behavior

[George C Brackett]

I recently uploaded to the new revOnline a text field behavior that  
allows only characters listed in a custom property (e.g., numbers and  
a decimal point) to be typed in the field.  I find it useful in  
minimizing the checking required for user entry.  The behavior is an  
adaptation of Devin Asay's Password Field behavior, also available on  
the new revOnline.

George