Hwrclassy

this version gets the final SFR segments from LevelpathID+confluence information; need to finalize the reaches and get the rest of the SFR input read in from the XML file; finally, need methods to write final files (SFR, GWV)

I fetched classy and merged to my local - kdiff3 never came up but git said the problems were resolved - then I pushed to my fork and now the pull request