in chimie.c, remove from do_chime all initialisations linked to the ComovingIntegrationOn. We put them now in chimie().

This causes the code to crash during restart, due
to a3inv not initialized if chimie_apply_thermal_feedback
was called before do_chimie :-).

git-svn-id: https://svn.epfl.ch/svn/gasp@33 67b3a02f-582b-4e65-a7f6-2b87bd0cff7a