directaccess: change rule from opt-in to opt-out
Before this patch we would opt-in commands for direct access and the default
filter for new repository was 'visible'.
With this patch, the default filter for new repos is
'visible-directaccess-warn'. It means that by default all the commands have
directaccess with warnings.
inhibit: move transaction wrapping outside of repo setup
Before this patch, transaction wrapping code was done in reposetup. It happened
to cause stackoverflows in repos with a lot of subreps.
This patch moves the wrapping to extsetup and avoids this problem.