bug: dust in non-cartesian geometries

[neutrinoceros]

I was having very odd results when using physics/mod_dust.t in polar (1.5D and 2D) geometries. In hd/mod_hd_phys.t I found that piece of comment :

!> Ileyk : to do :
!>     - address the source term for the dust
subroutine hd_add_source_geom(qdt, ixI^L, ixO^L, wCT, w, x)

indeed, this routine still completely ignores dust. I'll see if I'm able to fix this.

[neutrinoceros]

I proposed a solution to this issue here https://github.com/amrvac/amrvac/pull/3

[neutrinoceros]

solved ddeeb0c8631cb33e2d28823162409cb239eec5c8