Add description + parralle processing

Make small change to fully use the prallele computing capacity of
matlab. This will be use only if a license is avaible and the PC has
more than 1 CPU
calculation of coordinate if their are not present

If we use point which have just cartesian coordinate, we calculate the
polar ones.
ignore *.asv
change the display function

Add some scaling for the SHC and make the display on a sphere prettier