Pager support in the repl

I often find myself wishing for a pager in the repl when outputting large amount of output. I see that there is a Base.less but it is only used on files and not for outputting other stuff in the repl. In fact, it would be great to have support for less, head, and tail like functionality for looking at arrays, hashes, etc. Thus to be able to do, e.g., arr |> less or less(arr) or arr |> tail.

In addition, I think having the output of show() automatically go through less if it is longer that one page would be great. I hate seeing 100's of pages of output fly by when, e.g., a huge hash gets "shown" at the prompt (I just cannot seem to get in the habit of typing the ; at the right time). This behavior could be configurable of course.

NOTE: see also https://groups.google.com/forum/#!topic/julia-users/2SbdNdW_EEM