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Comments changes, no functionality changes. 

formatting and small changes related to code management, no functionality changes

merges-6

code merge

Also improve an error message in gtest_test_utils.py.

Refactors run_tests.py s.t. it can be shared by gmock (by Vlad Losev); Fixes a warning in gtest-tuple_test.cc on Cygwin (by Vlad Losev).

Blocks test binaries from inheriting GTEST_OUTPUT variable when invoked from Python test scripts (fixes issue 223).

Reduces the flakiness of gtest-port_test on Mac; improves the Python tests; hides methods that we don't want to publish; makes win-dbg8 the default scons configuration (all by Vlad Losev).

Implements a subset of TR1 tuple needed by gtest and gmock (by Zhanyong Wan); cleaned up the Python tests (by Vlad Losev); made run_tests.py invokable from any directory (by Vlad Losev).

Makes the Python tests more stable (by Vlad Losev); fixes a memory leak in GetThreadCount() on Mac (by Vlad Losev); improves fuse_gtest_files.py to support fusing Google Mock files (by Zhanyong Wan).

Makes the Python tests more portable by calling standard functions to interpret the result of os.system().  This could fix the broken Python tests on some users' machines.