Reconsider applicability of standards G1.5 / G1.6 on performance claims

[cforgaci]

G1.5 / G1.6 if future versions begin making explicit performance claims or if alternative implementations become available for benchmarking.

[cforgaci]

This might still not be applicable.

[cforgaci]

With #421, G1.5 is applicable, while G1.6 is not, as we do not compare with any other packages.