tests/types1: Split out set type test to set_types.

set isn't the most basic type and can be disabled by a port.

tests/basics/set_type.py

+# set type
+
+# This doesn't really work as expected, because {None}
+# leads SyntaxError during parsing.
+try:
+    set
+except NameError:
+    import sys
+    print("SKIP")
+    sys.exit()
+
+print(set)
+
+print(type(set()) == set)
+
+print(type({None}) == set)

tests/basics/types1.py

 # basic types
+# similar test for set type is done in set_type.py
 
 print(bool)
 print(int)
 print(tuple)
 print(list)
-print(set)
 print(dict)
 
 print(type(bool()) == bool)
 print(type(int()) == int)
 print(type(tuple()) == tuple)
 print(type(list()) == list)
-print(type(set()) == set)
 print(type(dict()) == dict)
 
 print(type(False) == bool)
 print(type(0) == int)
 print(type(()) == tuple)
 print(type([]) == list)
-print(type({None}) == set)
 print(type({}) == dict)
 
 try: