Bounding Hazard Tests

Add tests for BoundingHazards class

When should hazard maps (1Map<SiteClass, Map<Imt, XySequence>>1) be validated? Upon initial extraction (extractHazardsAt()) or in the interpolation routines (BoundingHazards.getTargetData() and NetcdfUtils.linearInterpolate())?

Edge cases:

• Requesting data for a point beyond grid points where hazard was calculated should result in an error (data not available), even though such grid points are included in the netCDF file (grid is rectangular)