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This merges a Google-internal change (117235625).

Original CL description:
This CL was created manually in about an hour with sed, a Python script
to find all the places unqualified 'string' was mentioned, and some help
from Emacs to add the "std::" qualifications, plus a few manual tweaks.

Suppresses the stack trace in a warning for uninteresting call by default; the stack trace will still be printed when --gmock_verbose=info is printed.

Adds a note in the "uninteresting mock method call" warning to advise people how to handle the warning.
Clarifies the purpose of utilities in gmock-port.h and adds guidance w.r.t. gmock-port.h vs gtest-port.h.
Pulls in gtest r674.

Renames internal enums to the kFoo naming style.

Fixes gmock doctor to work with newer versions of Clang.

Reduced template instantiation depth for the AllOf and AnyOf matchers. Also some formatting changes.

Fixes a lock reentrancy when destroying a mock causes destruction of another mock (issue 79) (by Aaron Jacobs).

Expressed the thread-safety annotations in code, replacing the existing comment-based system (by Aaron Jacobs).

Makes Google Mock compile much faster and use much less memory; reviewed by Nico Weber.  This fixes issue 68.

Adds threading support (by Vlad Losev); updates the version number (by Zhanyong Wan); adds release notes for 1.5.0 (by Vlad Losev).

Enables more verbose output for expectations (by Sverre Sundsdal); Fixes information loss warning when compiled by VC8.0 with /Wp64; Skips two tests on Windows Mobile that don't work there.

Removes duplicated definition of SetArgumentPointee (by Vlad Losev); Makes gmock compilable on platforms that don't have ::abort() (by Acadeli Checa); Fixes compatibility with Symbian's STLport (by Acadeli Checa).

Made the universal value printer safer when printing char[];
Removed duplicated code in InvokeWith;
Improved gmock_doctor.py.