Formats the contents of the Histogram into a simple acsii stem-leaf diagram.
If the bin boundaries are b0, b1, b2,...,bn-1, and the counts for these bins are c1, c2,...,cn, respectively, then the this method returns a string with the following format: Number SmallerCount: ***number SmallerCount [b0,b1): *****c1 [b1,b2): **********c2 [b2,b3): ***************c3 . . . [bn-2,bn-1]: *****cn Number LargerCount : *****number LargerCount. Where the number of '*'s is for a particular bin is equal to the count for that bin minus one.