Validation for G_Type and GS_Rel

Added validation schema and tests for columns 3.22 and 3.23.
This could also be simplified, e.g.:

    ADD(\.(err|f|met|n[rs]|q|s)*

... instead of ...

    ADD|ADD.err|ADD.err.s|ADD.f|ADD.met|ADD.nr|ADD.ns|ADD.q|ADD.s