Add missing execute_test.cmake script.
Require at least CMake 2.8.4 to avoid Cygwin legacy warning.
Pass --test_tmpdir and --srcdir to unittests.
Minor CMake coding style change of version_numbers function.
Fix VS security warnings using SafeGetEnv and SafeFOpen utility functions.
Fix VS linker warning regarding locally defined FLAGS_tryfromenv symbol.
Use _strtoi64 and _strtoui64 on Windows.
Create temporary directory for unit tests in specified --test_tmpdir if possible.
Enable test case which tests invalid negative value for uint64 flag.
Fix up use of SafeFOpen.