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Fix bug #2872452 (example code for ITEM was incorrect in the manual).

Refactoring: Make some of the argument parsing routines static and remove some dead code.

Fix a minor inefficiency in GetColorArgument() where a COLORREF was unnecessarily split into RGB values, then rejoined into the same COLORREF before being returned.

Fix bug #2813364; SETPENCOLOR and other commands that input a color now throw recoverable bad input errors on more bad input.

This change also centralizes the code for converting a color input into a color for more consistent behavior (before, SETPIXEL and GIFSAVE used a different function and so did not accept names for colors).

This change it not a big benefit for users. Instead, it was done to make the test pass go more smoothly.

This commit was manufactured by cvs2svn to create tag 'VER-6-25-0'.

Add in the changes from 6.25.0.

Update the SELECTBOX tests now that the OK and Cancel buttons don't have accessor keys.

Updated based on a successful 6.25.0 test pass.

Include turtle.bmp in the release.

Fix a regression where zooming to a very small number (1e-20) would cause the WM_PAINT handler to coerce a large number into an integer, resulting in an unhandled floating point exception. My fix was to keep the numbers as floating point values until they had been clipped into the proper range before converting them back into ints.