Merge pull request #904 from thongsav-usgs/master

Use updated bias shape file for test (includes avg_slope)
Merge pull request #905 from thongsav-usgs/master

Fixed compilation errors
adding bias and bias_uncy to calcs
Merge branch 'master' of https://github.com/USGS-CIDA/coastal-hazards
Merge pull request #906 from jread-usgs/master

adding bias and bias_uncy to calcs
Dates are sometimes typed as Timestamp, update getter to allow that.