delete-blank-lines minor convenience addition

[Dan Jacobson]

Regarding the last line of this:
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C-x C-o runs the command delete-blank-lines
   which is an interactive compiled Lisp function in `simple'.
(delete-blank-lines)

On blank line, delete all surrounding blank lines, leaving just one.
On isolated blank line, delete that one.
On nonblank line, delete any immediately following blank lines.
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Why restrict it to only the next line.  If the next blank line occurs
2 lines down, why not operate on that too.  If you are afraid of
making unseen changes off the screen, give a message in the minibuffer
that you have deleted a blank line at line XXX.
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