Added extra Space Group synonyms for P2221 and P21212 non-std settings

Author: rhfogh

mxcubecore/model/crystal_symmetry.py

@@ -207,10 +207,16 @@
     ),
     SpaceGroupInfo(number=16, name="P222", crystal_class="222P", synonyms=("P 2 2 2",)),
     SpaceGroupInfo(
-        number=17, name="P2221", crystal_class="222P", synonyms=("P 2 2 21",)
+        number=17,
+        name="P2221",
+        crystal_class="222P",
+        synonyms=("P 2 2 21", 'P2212', 'P 2 21 2', 'P2122', 'P 21 2 2')
     ),
     SpaceGroupInfo(
-        number=18, name="P21212", crystal_class="222P", synonyms=("P 21 21 2",)
+        number=18,
+        name="P21212",
+        crystal_class="222P",
+        synonyms=("P 21 21 2",'P21221', 'P 21 2 21', 'P22121', 'P 2 21 21')
     ),
     SpaceGroupInfo(
         number=19, name="P212121", crystal_class="222P", synonyms=("P 21 21 21",)