FIX: semesterid when binding global discipline #606

db/postgresql/issue606_globaldiscipline_bind.sql

+
+ALTER TABLE ONLY global_disciplines
+    DROP CONSTRAINT global_extid_key;
+
+ALTER TABLE ONLY global_disciplines
+    ADD CONSTRAINT global_extid_semester_key UNIQUE (externalid, semesterid);
+
+CREATE OR REPLACE FUNCTION public.discipline_bindglobal(pdisciplineid integer, psemester integer, pdisciplinename character varying, pglobalid character varying)
+    RETURNS integer
+    LANGUAGE plpgsql
+AS $function$
+declare vID int;
+begin
+    INSERT INTO global_disciplines (disciplineid, semesterid, name, externalid) VALUES(pdisciplineid, psemester, pdisciplinename, pglobalid)  returning id into vID;
+    UPDATE disciplines SET isglobal=TRUE WHERE disciplines.id = pdisciplineid;
+    RETURN vID;
+END;
+$function$;