Disallow Ctrl-C during most libRebol operations
Disallow Ctrl-C during most libRebol operations

It is not possible to neatly handle Ctrl-C cancellations during
a libRebol call; one must be using some cancellable form.  Until that
API is hammered out, this prevents the prior behavior (which was to
raise an error on any API call to happen after the Ctrl-C).

hostilefork/rebol,giuliolunati/ren-c,giuliolunati/ren-c,hostilefork/rebol,hostilefork/rebol,hostilefork/rebol,giuliolunati/ren-c,hostilefork/rebol,giuliolunati/ren-c,hostilefork/rebol,giuliolunati/ren-c