Merge pull request #7 from jread-usgs/master

Added two new functions for getting surface elevation and subsetting depths
Merge pull request #8 from jread-usgs/master

Added plot to model vs observation comparison, disp standard error
Merge pull request #9 from jread-usgs/cfa4f1e71f80275970087dad6dd6e8aefad3eae9

Added new functions for Lake Analyzer formatting
Merge remote-tracking branch 'upstream/master'