BUG : in read_ic.c, StP must be offset by the number of gas particles, -> offset + n --> offset + n - header.npart[0]
Now, the code can restart from a snapshot file if only
one cpu is used.
git-svn-id: https://svn.epfl.ch/svn/gasp@37 67b3a02f-582b-4e65-a7f6-2b87bd0cff7a