v0.9.0 - 2019-11-07 New routine: emg3d.utils.Fourier, a class to handle Fourier-transform related stuff for time-domain modelling. See the example notebooks for its usage. Utilities: Fields and returned receiver-arrays (EMArray) both have amplitude (.amp) and phase (.pha) attributes. Fields have attributes containing frequency-information (freq, smu0). New class SourceField; a subclass of Field, adding vector and v{x,y,z} attributes for the real valued source vectors. The Model is not frequency-dependent any longer and does NOT take a freq-parameter any more (currently it still takes it, but it is deprecated and will be removed in the future). data_write automatically removes _vol from TensorMesh instances and _eta_{x,y,z}, _zeta from Model instances. This makes the archives smaller, and they are not required, as they are simply reconstructed if needed. Internal changes: The multigrid method, as implemented, only works for the diffusive approximation. Nevertheless, we always used \sigma-i\omega\epsilon, hence a complex number. This is now changed and \epsilon set to 0, leaving only \sigma. Change time convention from exp(-iwt) to exp(iwt), as used in empymod and commonly in CSEM. Removed the parameter conjugate from the solver, to simplify. Change own private class variables from __ to _. res and mu_r are now checked to ensure they are >0; freq is checked to ensure !=0. New dependencies and maintenance: empymod is a new dependency. Travis now checks all the url's in the documentation, so there should be no broken links down the road. (Check is allowed to fail, it is visual QC.) Bugfixes: Fixes to the setuptools_scm-implementation (MANIFEST.in).