Removed using structure names when perceiving type
Using structure names is too dangerous to use by perceiving if text is a name or SMILES and there is no easy test for valid SMILES. So changed to only using names if the user specifies names.
Using structure names is too dangerous to use by perceiving if text is a name or SMILES and there is no easy test for valid SMILES. So changed to only using names if the user specifies names.