Added ruthfix header.
Added ruthfix header.

humdrum-tools/minHumdrum,craigsapp/humlib,craigsapp/minHumdrum,humdrum-tools/minHumdrum,craigsapp/humlib,humdrum-tools/minHumdrum,craigsapp/minHumdrum,craigsapp/minHumdrum,craigsapp/humlib