Converts a string of 0's and 1's into index positions of the 1's
padding the results by 0's so they are all the same length
     
    
    
    Arguments
- x
 
a character vector whose values are all either "0" or "1". All elements of
the vector must be the same length
 
 
    
    Details
    i.e.
patmap(c("1101", "0001"))  ->   list(c(1,2,4,999), c(4,999, 999, 999))