Commit 0f5ce6014a ("SCRIPTS: announce-release: place the send command
in the mail's header") broke the announce-release script: by not having
to edit the message at all anymore, mutt does nothing when sending, but
it still does if the message is edited (which was the case before). With
some testing, it appears that mutt -H does work when there's no change,
so let's use this instead. This should be backported till 1.7.
I managed to mess up with the file's permission while using a temporary
one during last release, and to backport the non-exec version everywhere.
This can be backported as far as 1.7 now.
I'm fed up with having to scroll my terminals trying to look for the
mail send command printed 30 minutes before the release, let's have
it copied into the e-mail template itself, and replace the old headers
that used to be duplicated there and that are not needed anymore.
Given that some OSes have bash in /usr/local/bin and in order not to
give too easy an excuse to Olivier for not backporting fixes, let's
make a few scripts rely on /usr/bin/env bash instead of /bin/bash :-)
These ones have been used for several months already and are quite
convenient to emit new releases and backport fixes. I'm fed up with
having different versions on different machines, let's commit them
now.
