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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.

Erase .bak files with gmake clean. These are generated by my diffing tool (WinMerge).

Explicitly call out that BITMAPTURTLE can only map turtle 0 to bitmap 0, turtle 1 to bitmap 1, turtle 2 to bitmap 2, etc. This caused some confusion and resulted in a lot of frustration for at least one user.