create xref in database of surgo code to soil file
Add some more layers and permalink support
whack-a-mole fixes
Create tool to proctor prj2wepp execution!
database schema updates to support flowpaths
Jim Frankenberger kindly released a Linux version of prj2wepp, so we
don't have to fuss with windows anymore! :)  Also, keep all slopes at
least 0.0001 as prj2wepp does not like zero slopes