vol.act: generic functions to determin protein activity
In Biotech: Diverse Applications for Biotechnology

All Volumes should be given with same metrics

1	vol.act(vol.tot = 1, dfac = 1, delta.E, vol.test, epsilon, cuvette = 1)

`vol.tot`	total volume, default is 1
`dfac`	dilution factor, default is 1
`delta.E`	Delta E (without default)
`vol.test`	test volume (without default)
`epsilon`	molar attenuation coefficient (without default)
`cuvette`	cuvette factor or path length, default is 1