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see #3762

see #3206

The for i in {x..y} construct is Bash-specific. An alternative would have
been for i in $(seq x y) but seq comes from GNU and is therefore not POSIX. A
good old-fashioned while does the job!

Fixes #3197

This will help testing the effect of some parameter on all the functional tests.

This will be more flexible.

By default the launcher is put at the start of the command line. In some cases
it must not be at the start and in other cases we don't want to use valgrind
(or another launcher) so we deactivate it with the !NO_LAUNCHER: directive

Bug: With a reasonnably large -r option (such as 2000), no representative is found.
This is because min_cover is larger than max_auditioned.