Rename Signal.align_1D to Signal.align1D
Rename several *_1D methods to *1D for consistency and rename estimate_2D_translation.
- estimate_shift_1D -> estimate_shift1D
- shift_1D -> shift1D
- find_peaks_1D -> find_peaks1D
- interpolate_1D -> interpolate1D
- estimate_2D_translation -> estimate_shift2D