Astrobj: add "const" keyword to rMax()
ThinDiskPL: rename Rmin, Rmax to Rinner, Router

PolishDoughnut: redefine r_cusp_ to solve high spin problem ;
new correct version of p_mag implemented in Komissarov
ThinDiskPL: just remove Rmin and Rmax, they shadow InnerRadius and OuterRadius!
Merge branch 'master' of github-paumard:gyoto/Gyoto
Merge branch 'master' into odeint