Added typedef for CWindow -- window coordinate structure, also prototypes for plAddCWindow() and plClrCWindows(void) (contributed by Paul Casteels). Also prototype for new plLibOpen() function.
Added typedef for CWindow -- window coordinate structure, also prototypes
for plAddCWindow() and plClrCWindows(void) (contributed by Paul Casteels).
Also prototype for new plLibOpen() function.

svn path=/trunk/; revision=1215

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