Removed defaults for depleted_in properties.
Added calculated field conditions, removing default empty strings.
Fixed accidental deletion.
Fixed mouse newborn mapping.
Added back empty strings.
Don't default model_organism_sex - does not apply to human biosamples.
Fix conditions for biosample inferred units; don't default to empty strings for inferred values.
Merge pull request #302 from ENCODE-DCC/1131-fixes

#1131 fixes