Arbitrary waveforms

This version finally introduces the possibility for arbitrary waveforms.

• Modelling routines:

  • bipole and dipole:

    • Arbitrary waveforms: Time-domain modelling can new be done for any
      arbitrary piecewise linear waveform, in addition to impulse
      (signal=0), step-on (signal=1), and step-off (signal=-1)
      responses.
    • User-defined bandpass filters can now be applied to the frequency domain
      result through user-provided functions.

  • Merged loop into bipole; there is no need for a special routine.
    Simply use bipole with msrc='b' and mrec=True for the same
    effect.

• New prints (if verbose):

  • The source/receiver types are new printed.
  • The signal/waveform is new printed.

• New function empymod.utils.check_waveform, to check the waveform.

• New deprecations (will be removed in v3):

  • empymod.model.loop will be removed in v3.
  • empymod.utils.check_bipole: New signature, it now returns also the
    src/rec field and
    type; old signature will be removed in v3.
  • empymod.utils.check_time: New signature, it now also returns the
    signal; old signature will be removed in v3.
  • empymod.utils.check_time_only: New signature, it now also returns the
    signal; old signature will be removed in v3.

• Bumped the minimum requirements to:

  • Python 3.11
  • NumPy 2.0
  • SciPy, Numba, libdlf, scooby (without minimum version)