try to get at least 3 datapoints
Support for --min-scaling-points in timeall

Add the --min-scaling-points option to timeall (default 3) and use it
to ensure that scalable tests are timed at enough different scales to
give a decent idea of each compiler's scaling curve, even when a given
compiler is performing very poorly on a particular test.
Merge branch 'minimum_number_runs'
Fix $*PERL<compiler> deprecations in `bench config`