struct: Start more compliant struct module implementation than ustruct.

struct/struct.py

@@ -0,0 +1,13 @@
+from ustruct import *
+
+class Struct:
+
+    def __init__(self, format):
+        self.format = format
+        self.size = calcsize(format)
+
+    def unpack(self, buf):
+        return unpack(self.format, buf)
+
+    def pack(self, *vals):
+        return pack(self.format, *vals)