Apply fixes, remove duplicates.

Apply fixes to _random, cStringIO, errno, operator, sys, zlib, etc.; also,
remove duplicate 2.7/math.pyi, 2.7/marshal.pyi.

builtins/2.7/thread.pyi

@@ -1,16 +1,33 @@
+"""Stubs for the "thread" module."""
 from typing import Callable, Any
 
+def _count() -> int: ...
+
 class error(Exception): ...
+
 class LockType:
     def acquire(self, waitflag: int = None) -> bool: ...
+    def acquire_lock(self, waitflag: int = None) -> bool: ...
     def release(self) -> None: ...
+    def release_lock(self) -> None: ...
     def locked(self) -> bool: ...
+    def locked_lock(self) -> bool: ...
     def __enter__(self) -> LockType: ...
     def __exit__(self, value: Any, traceback: Any) -> None: ...
 
+class _local(object):
+    pass
+
+class _localdummy(object):
+    pass
+
+def start_new(function: Callable[..., Any], args: Any, kwargs: Any = None) -> int: ...
 def start_new_thread(function: Callable[..., Any], args: Any, kwargs: Any = None) -> int: ...
 def interrupt_main() -> None: ...
-def exit() -> None: ...
+def exit() -> None:
+    raise SystemExit()
+def exit_thread() -> Any:
+    raise SystemExit()
 def allocate_lock() -> LockType: ...
 def get_ident() -> int: ...
 def stack_size(size: int = None) -> int: ...