Added the "age_rank" column to the "Specimen" and "Scan" tables to sort the "Age" column based on the following categories:  - embryonic day  - Post natal day  - hours  - days  - weeks  - months  - adult
Added the "age_rank" column to the "Specimen" and "Scan" tables to sort the "Age" column based on the following categories:
 - embryonic day
 - Post natal day
 - hours
 - days
 - weeks
 - months
 - adult

informatics-isi-edu/microscopy,informatics-isi-edu/microscopy,informatics-isi-edu/microscopy,informatics-isi-edu/microscopy