#109 Code folding for comments

[Don Taylor]

(1) Add code folding for multi-line comments - both
docstrings and # block comments.

(2) Have a separate key sequence/tool button to
fold/unfold all multiline comments in the current module.

Good comments can take up a lot of screen real-estate
especially if you are using doctest or trying to do
some form of literate programming. It would be really
handy to be able to make them easily disappear/reappear
when coding or debugging.

I think that the Eclipse Java Editor supports comment
folding.

[Fabio Zadrozny]

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Half-done for 1.2.8 (still needs the keybinding)