Add $abort_noattach and $abort_noattach_regexp options.
$abort_noattach_regexp is matched against the body of a message. If so, the $abort_noattach quadoption is used to prompt whether to abort sending. Thanks to Antonio Radici for bringing the original version of the patch to our attention, which he pulled from https://github.com/tlvince/pkgbuild/blob/master/mutt-kiss/mutt-attach.patch This version was rewritten to use a regexp, to fix a few issues, and to better fit in with Mutt styles and conventions.
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