Fixing iterators

Python3 requires the `next` function to be called `__next__`, which is implicitly called when generating the next value using the iterator

Author: ImanolBarba

ps2mc.py

@@ -512,7 +512,7 @@ def write_raw_ent(self, index, ent, set_modified):
 		self.f.write(pack_dirent(ent),
 			     _set_modified = set_modified)
 
-	def next(self):
+	def __next__(self):
 		# print("@@@ next", self.tell(), self.f.name)
 		dirent = self.f.read(PS2MC_DIRENT_LENGTH)
 		if dirent == b"":