Add a REPL option to print x number of value from the stack after each cycle

[jeremyheiler]

The tentative name for this option is --print. The default value will be 1, but it can be any non-negative integer.

After cycle, if the value is 0, no values will be printed. If the value is 1, the value at the top of the stack will be printed. If the value is 2, the top 2 values will be printed, and so on. If the value is all, the entire stack will be printed.