[request] info: don't allow ^C to quit the program

[Benno Schulenberg]

When someone who is not familiar with info tries it out,
types something, and gets stuck, he will type ^C to get
unstuck.  This has the unfortunate effect that it quits
the program.  It would be better if this key were bound
by default to key-abort.  This would also make --vi-keys
more useful.

To "compensate" for the loss of a quit key, I would suggest
to bind also ^Q to quit.  (The key is currently not bound,
and many programs respond to ^Q, so why not info too?)

And when adding some generally known bindings anyway,
maybe also add ^W for delete-window?

Benno

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