Work with ZFIN to clean up chemical treatments in db

The 'environment' tables we are supplied from zfin are not clean w.r.t. the contents of it's 'condition content' column. The values are a mixed bag between classes of contents (e.g. "pharmaceutical drug") identifiers (cyclopamine (CAS: 4449-51-8)), and plain text words (i.e. "other").

We need to work with ZFIN to clean up this table, or perhaps supply another table that has these things, with the correct identifiers, in clean columns. Otherwise, we won't be able to properly link to pubchem/drugbank/etc.