v2, v3, integration branch

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Move files into new v2 + v3 directory structure

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Remove unused file and directory

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Remove unused directories

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Rename files to workaround Visual Studio build system bug.

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Initial source code changes to achieve integration

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Add Build and Test support. Build is working, a few tests are working.

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All V3 tests passing

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V2 tests added. All tests passing on at least one compiler, none passing on all compilers

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All tests passing on Windows, gcc + msvc. Changed convenience_test to eliminate chance of test directory name race condition when multiple tests run together.

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Preliminary doc updates

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merge trunk

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Update msvc solutions

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Massage msvc folder names

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Still trying to reverse mistaken rename

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Fix #3241

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Fix symbol visibility problem causing Linux/GCC test failures

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Remove duplicate macro displays

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delimit_string initial commit

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Fix all known issues, wishes

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