adds mars model with SH format; updates spiral model; adds initializations

[danielpeter]

• Mars spherical harmonics format:

  • in Par_file use: MODEL = mars_SH_model
  • model data in DATA/mars/SH_model provided for case65(TAY)
  • example provided in EXAMPLES/mars_global/

• spiral model update:

  • no crustal smoothing for NEX >= 144
  • no time step reduction for NEX >= 144

[danielpeter]

oh buildbot, where are thou... will merge manually