While trying HydroOpt on some of our earlier aqualog files (after converting to the format HydroOpt needs) I found various errors. I made the fxn more flexible --so that if the user specifies a wavelength in rangeReg or wavelength that is not measured in the input absorbance file the fxn finds the nearest wavelength and uses that absorbance value.
Merge pull request #35 from schristel-USGS/master

While trying HydroOpt on some of our earlier aqualog files