#1 Add Highlighting when marking selection.

[Michael Newcomb]

Added the ability to highlight the marked text.

Added UnsetMark (ctrl-g).

I've included the entire build file for completeness.
If you add me to the project, I'll update the code in
CVS.

Michael

[Michael Newcomb]

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Updated the patch, had a bug with copying a region not
unsetting the region.

[Michael Newcomb]