Enable Comments in QText and QL

(Missing Feature, Closed -> Fixed, Priority: High, Test Status: No automated tests yet , Reported By Bad Link: Thing 3y284of not found, )
Summary: That is, "comments" in the programming-language sense: notes on the code, not visible to the end user.

From email: Alexx:
Is there a way to insert Comments into QText? In the programming sense of "This is a note from the page author to himself, not something that is meant to be evaluated and displayed in normal use."
Justin: Not yet, although I'm open to the idea -- feel free to make a Missing Feature request. (And note that QText and QL are totally separate in this regard, and would probably need separate solutions.)
Justin: Okay, I find that I want this myself, at least in QL. I don't think most people will be commiting quite such insane QL expressions as I'm doing, but I occasionally have to remind myself what's going on...
Justin: Now implemented in QL. Works in traditional Java-family style: put "//" in a line, and everything to the end of that line is now a comment. So you can do things like this:
[[Issue._instances ->
  // This sorts in descending order by last changed time
  _sort(_desc(_modTime))]]