DISCO: import additional data for ZFIN

Add the following data tables into DISCO nif-0000-21427 (ZFIN):

chromosomal landmarks: http://zfin.org/downloads/mappings.txt
(col headers: ZFIN ID,Symbol,Panel,Symbol,Chromosome,Location,Metric)
I think we currently want this filtered on genes, with the first col like ZDB-GENE-*
note that cR (centiRay) are: a percent frequency of radiation-induced breaks between a pair of markers after exposure to X-rays

genotype backgrounds: http://zfin.org/downloads/genotype_backgrounds.txt
genbank ids: http://zfin.org/downloads/file/genbank.txt
uniprot ids: http://zfin.org/downloads/file/uniprot.txt
wildtype genotypes: http://zfin.org/downloads/file/wildtypes.txt

the genbank and uniprot ids tables should just be lookup tables to add cols into the Genes view, I think.

as for the genotype backgrounds table, we may want to turn this into some kind of geno-pheno table, where the pheno would just be "wild-type", or "normal", or something like that.

some time later, we will want to bring in actual genomic coordinates, but for now the genetic map will be sufficient and not too bulky.