mods in mml/applications/mml, BO.V901, fieldmaptrack

- added function lnls_calc_poly_from_coeffs.py to calculate polynom from
  its coefficients
- modifications in lnls_plot_cod.m
- added new booster optics mode V901: segmented model of dipole was
  recalibrated using new fieldmap analysis in python. Chromaticities
  were also corrected from ~[+2,+1] to [0.5,0.5]. Working point remains
  the same. Small increase in worst-case beam lifetime: 0.25h->0.30h
- now Multipole class in fieldmaptrack has a 'save' method to export
  multipoles along trajectory to an ascii file.