- added Brune and Smoothed Brune source time functions #175

Job	Run time
Check file changes	18s
Test Intel on ubuntu-20.04	5m 56s
Test on ubuntu-latest	2m 22s
Test on Mac	11m 7s
Test on ubuntu-20.04	2m 10s
Test run example 1 - meshfem3D simple model	3m 50s
Test run example 2 - fault tpv5	5m 25s
Test run example 5 - socal1D	3m 14s
Test run example 3 - layered halfspace	3m 20s
Test run example 0 - make tests	6m 53s
Test run example 6 - socal1D 1d_socal	3m 44s
Test run example 7 - socal1D 1d_prem	3m 25s
Test run example 8 - socal1D 1d_cascadia	3m 13s
Test run example 9 - coupling FK	3m 41s
Test run example 10 - homogeneous halfspace	2m 46s
Test run example 11 - poroelastic	3m 7s
Test run example 12 - PML elastic	2m 36s
Test run example 14 - waterlayered halfspace	3m 44s
Test run example 13 - PML acoustic	2m 13s
Test run example 15 - tomographic model	2m 58s
Test run example 16 - cavity	2m 43s
Test run example 17 - sep bathymetry	2m 58s
Test run example 18 - socal1D hdf5 i/o	3m 34s
Test run example 4 - small adjoint	3m 48s
	1h 29m 5s

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