improving the ramses plugin
This set of modifications/commits basically improves the way of reading RAMSES data. It includes:
- an OpenMP reader of AMR/Hydro/RT files
- various strategies to get cells properties from RAMSES outputs
- the possibility to read RT variables
- indices of Hydro and RT variables is parametrized
- some improvements in reading stellar particles
(Note: many of these changes are contributions by Jeremy Blaizot and Joki Rosdahl)