cycle(var x,var a,var b);
returns x 'wrapped around' the range a..b.
Parameters:
x - value to be calculated
a - lower limit
b - upper limit (not including)
Returns:
  
  
    | x+b-a | 
    while x is less than a | 
  
  
    | x-b+a | 
    while x is greater or equal b | 
  
  
    | x | 
    if x is between a and b | 
  
 
Speed:
  Fast
  Example:
		
x = cycle(3.5,0,1); // sets x at 0.5
See also:
		
clamp