Support for gathering a minimal number of samples per benchmark, using the optional `--min-samples` argument, which overrides the automatically computed number of samples per `sample-time` if this is lower�.

Added support for running benchmarks using substring filters. Positional arguments prefixed with a single + or - sign are interpreted as benchmark name filters.

Excecutes all benchmarks whose names include any of the strings prefixed with a plus sign but none of the strings prefixed with a minus sign.

Added --meta option to log measurement metadata:

* PAGES – number of memory pages used
* ICS – number of involuntary context switches
* YIELD – number of voluntary yields

(Pages and ICS were previously available only in --verbose mode.)