add spacegroup 154

Signed-off-by: Wolfgang Ludwig <wolfgang.ludwig@esrf.fr>

zUtil_Cryst/gtCrystGetSymmetryOperators.m

@@ -316,7 +316,7 @@ switch (crystal_system)
             spacegroup = 167;
         end
         switch (spacegroup)
-            case {167}
+            case {167, 154}
                 % 6 operators, also return in 3 index format
                 % however, this doesn't seem right when looking at the alumina
                 % datasets... more work to do.

zUtil_Cryst/gtCrystRodriguesFundZone.m

@@ -58,7 +58,7 @@ switch spacegroup
         
 		
 	% Hexagonal	
-	case {663, 194, 167,152}    
+	case {663, 194, 167, 152, 154}
 		
 		% Bottom and top of the polyhedron (basal planes):
 		limbase = 2-sqrt(3);  % half thickness along basal plane