Field data improvements #696

Job	Run time
list-examples	7s
examples/machine-learning/example_born_fully_connected.jl	9m 4s
examples/machine-learning/example_extended_source.jl	8m 39s
examples/machine-learning/example_extended_source_cnn.jl	9m 6s
examples/scripts/extended_source_lsqr.jl	6m 20s
examples/scripts/fwi_example_2D.jl	6m 53s
examples/scripts/fwi_example_ADloss.jl	8m 2s
examples/scripts/fwi_example_NLopt.jl	6m 32s
examples/scripts/fwi_example_constraints.jl	7m 13s
examples/scripts/fwi_example_minConf.jl	6m 41s
examples/scripts/fwi_example_studentst.jl	7m 0s
examples/scripts/fwi_gauss_newton.jl	7m 14s
examples/scripts/illum.jl	7m 14s
examples/scripts/imaging_conditions.jl	6m 50s
examples/scripts/lsrtm_2D.jl	7m 39s
examples/scripts/modeling_basic_2D.jl	7m 16s
examples/scripts/modeling_basic_3D.jl	7m 5s
examples/scripts/modeling_basic_elastic.jl	6m 23s
examples/scripts/modeling_extended_source_2D.jl	6m 45s
examples/scripts/modeling_extended_source_3D.jl	7m 16s
examples/scripts/modeling_medical_2D.jl	6m 35s
examples/scripts/modeling_wavefields_2D.jl	6m 40s
examples/scripts/splsrtm_2D.jl	7m 12s
	2h 39m 46s

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