Changed coord discretization to km instead of deg
Changed coord discretization to km instead of deg

We want to introduce latitudinal discretization as well (to minimize
distortions). In doing so, we want to use a distance measure (which is
aboslute) rather than a degree measure (which relative, depending on the
location between the equator and one of the poles.

gem/oq-engine,gem/oq-hazardlib,larsbutler/oq-hazardlib,gem/oq-hazardlib,silviacanessa/oq-hazardlib,mmpagani/oq-hazardlib,ROB-Seismology/oq-hazardlib,mmpagani/oq-hazardlib,rcgee/oq-hazardlib,vup1120/oq-hazardlib,larsbutler/oq-hazardlib,ROB-Seismology/oq-hazardlib,g-weatherill/oq-hazardlib,g-weatherill/oq-hazardlib,ROB-Seismology/oq-hazardlib,ROB-Seismology/oq-hazardlib,vup1120/oq-hazardlib,silviacanessa/oq-hazardlib,gem/oq-engine,rcgee/oq-hazardlib,gem/oq-engine,g-weatherill/oq-hazardlib,larsbutler/oq-hazardlib,silviacanessa/oq-hazardlib,vup1120/oq-hazardlib,gem/oq-hazardlib,gem/oq-engine,mmpagani/oq-hazardlib,gem/oq-engine,silviacanessa/oq-hazardlib,g-weatherill/oq-hazardlib