Fill missing columns before munging.

This way, we don't need to check if a column exists during the munging
step.
Fixed a lot of 'Multiple entries found...'

By restricting the length of the chromosome value returned from
EnsEMBLdb, we exclude the assembly patches.
Based on OMIM morbid, create gene list.

OMIM morbid can be downloaded. This script will reformat that list into
a basic gene list. One still needs to put the list through fetch_info to
complete the missing information.
Added chromosome as new column

Extracted the chromosome information from the gene locus.
Merge branch 'ftp_omim_genelist_creation' of https://github.com/Clinical-Genomics/GeneLists into ftp_omim_genelist_creation