Merge pull request #5 from eheien/master

Add tolerance checks for twilight tests
Adding twilight reference solutions for tha gaussian hill test case
Merge branch 'master' of github.com:andersp/sw4
Added another set of tests for attenuation+topography+supergrid
Changing names of some directories for testing
Removing some image files
Lamb's test case 2 and changing the format in usgs time series
Adding reference solutions for Lamb's problem
Adding pointsource tests with supergrid
Updated test suite

Fixed test script to handle multiple output lines, parameterized
twilight tests in CMake, added testing levels to avoid long running
tests