mseed: changed t0 to be of type float64 to hold large and precise starting times

Signed-off-by: LK <LK@uni>
simpleplotEDI...pushed pahses into nice quadrant

Signed-off-by: LK <LK@uni>
forced mt_Z to compute resistivity and phase otherwise returned zeros
added key word geometric_mean for plotting ellipses
added geometric_mean to residual phase tensors
fixed plo_residual_pt_maps to accomodate files with different frequencies and plot geometric mean as the colors
Merge branch 'master' of https://github.com/geophysics/mtpy
occam2d.py: repaired projection of stations onto profile - had bug for profiles that cross UTM zone borders

Signed-off-by: LK <LK@uni>
z.py: suppressed the spurious error message about missing frequencies when initialising an empty Edi/Z object

Signed-off-by: LK <LK@uni>
occam2d - change phase angle so it's in the right quadrant
adding functionality to modem_new
Merge branch 'master' of https://github.com/geophysics/mtpy into jp.modem
Merge branch 'jp.modem' of https://github.com/geophysics/mtpy into jp.modem