Changed dropdowns to Study type i/o Test type
Changed Admin home page for Chip Studies i/o Assay runs
Added derfault Study Type = 'TOX'
Switched Chip Results to be linked to AssayRuns aka Chip Study
Added ChipReadout to inline for results
Added verbose_name='Study ID' to assay_run_id
Added study_types concatenation of type1, type2, type3 and added study_types to list_display