Merge branch 'develop' into 'master'

tests/test_projector/jac_y00.npy

tests/test_projector/jac_y45.npy

tests/test_projector/jac_y90.npy

tests/test_projector/jac_z.npy

tests/test_projector/ref_mag_proj_x.hdf5

tests/test_projector/ref_mag_proj_x00.hdf5

tests/test_projector/ref_mag_proj_x45.hdf5

tests/test_projector/ref_mag_proj_x90.hdf5

tests/test_projector/ref_mag_proj_y.hdf5

tests/test_projector/ref_mag_proj_y00.hdf5

tests/test_projector/ref_mag_proj_y45.hdf5

tests/test_projector/ref_mag_proj_y90.hdf5

tests/test_projector/ref_mag_proj_z.hdf5

tests/test_projector/ref_magdata.hdf5

tests/test_regularisator.py

tests/test_regularisator/first_order_cost_ref.npy

tests/test_regularisator/first_order_jac_ref.npy

tests/test_regularisator/first_order_jac_vec_ref.npy