* glom/mode_design/users/dialog_groups_list.cc: on_button_group_new():
Move the group creation code to:
* glom/libglom/db_utils.[h|cc]:

* glom/libglom/privs.[h|cc]: set_table_privileges():
Return a bool to report failures.
* Makefile_tests.am:
* tests/test_selfhosting_new_empty_then_users.cc: Add this test to
test simple creation of a group and a user.