Getting LineDesign to work in new repo format

- The original LineDesign committed (yesterday) was not the most recent version of LineDesign
- - Updated to the most recent version (which involved getting rid of an old try/except statement)
- - Adjusted all instances in LineDesign where the Mooring.dd is referenced to use subcomponents instead of sections and connectors (other strategies could have been used to reference what we needed, but I went for the change in indexing strategy)
- Added a new test script for LineDesign changes (only runs 3 very quick DEA-Chain optimizations)
- Needed to fix a parenthesis bug in mooring.py in addCorrosion to reference the subcomponent

Author: shousner