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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.

Add a reference to the online chapter from Brian Harvey's book from which this program comes. This was done at Daniel Ajoy's recommendation.

Fix bug #1732803; TRACE now properly traces "rest" inputs.