Switch from system admin to granular permission for admin menu in datasets

[fguitton]

A change was introduced in 2caa29d which requires to be reverted once the permission system is reviewed and permits hiding menu items more granularly.

This joins up the effort of dsi-icl/acacia#577

ideafast-portal/packages/itmat-ui-react/src/components/datasetDetail/index.tsx

Lines 34 to 44 in 2caa29d

	<Query<any, any> query={WHO_AM_I}>
	{({ loading, error, data }) => {
	if (loading) return <LoadSpinner />;
	if (error) return <p>{error.toString()}</p>;
	if (data.whoAmI.type === userTypes.ADMIN)
	return (
	<NavLink to={`/datasets/${studyId}/admin`} activeClassName={css.active}>ADMINISTRATION</NavLink>
	);
	return null;
	}}
	</Query>