Validation for G_Type and GS_Rel

Added validation schema and tests for columns 3.22 and 3.23.
Looks good, but some parts could be made more concise, e.g.:

    R\.[adm](\.(e|pp))*

... instead of ...

    R\.a|R\.d|R\.m|R\.a\.pp|R\.d\.pp|R\.m\.pp|R\.a\.e|R\.d\.e|R\.m\.e