added dummy write_xyz
added dummy write_xyz

tjduigna/exatomic,exa-analytics/exatomic,exa-analytics/exatomic,avmarchenko/exatomic,avmarchenko/exatomic,tjduigna/exatomic,alexvmarch/atomic,exa-analytics/exatomic,avmarchenko/exatomic,exa-analytics/atomic,tjduigna/exatomic,exa-analytics/atomic,exa-analytics/exatomic,alexvmarch/atomic