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Refactoring: Make TScreenWindow::m_ScreenDeviceContext and TScreenWindow::m_MemoryDeviceContext private and provide inline accessors for them. This prevents and client code from inadvertantly modifying the values of these member variables.

Add some performance measurements for version after 6.12.0.

Bump the expected version to 6.16.0+.

Move getting the screen and memory device contents for TScreenWindow into TScreenWindow::SetupWindow() so that these didn't have to be created for each drawing operation. This done to improve performance. After thi change the CIRCLE command was 50% faster and drawing squirals was 10% faster.

This commit was manufactured by cvs2svn to create tag 'VER-6-15-0'.

Add some tests for ` and improve the tracing tests.

Bump the verson to 6.15.0 in preparation for the next release.

Copy new features for 6.15.0 in preparation for the next release.

Ignore .bak files. These are generated by my diffing tool (WinMerge).

Clarify that REMPROP may delete an empty property list.