parse_compile.cpp - two commands, compile stars and compile grains, failed
with mallocing array of length zero in atmdat_readin because the chemistry
network had not been established when atmdat_readin was called. Fix is to not
call atmdat_reading or ContCreatePointers? when parsing these two commands
since only continuum needs to be set up.
atmdat_readin.cpp now checks that chemistry network has been established
before this routine is called. This would only fail if there were a major
logical error in the order of calling setup routines.
