changed default soil density from 140 to 120 pcf per AASHTO standards.
changed live load calculation method. Changed names and inputs for live load. Added a new deptherror to catch too shallow installations.
addition of html/js for custom loading.
added 'minimum' to html
functioning custom pipe live loading
changed the pipe load to be it's own output for any loading condition for visibility
got js working for pipe load display.
returned run.py to production mode
Merge branch 'loadmods'