commit: bidi caret (breaks tree)

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This fixes the bidi caret that got broken when the caret class was
introduced; this commit breaks everything but the win32 build --
sorry guys, but it could not be helped.

The critical changes are to gr_Graphics::saveRectangle() and
gr_Graphics::restoreRectangle(). These functions now take an extra
index parameter making it possible to save and restore a number of
rectangles at the same time; the win32 versions are implemented,
others are not. Although the carect class only needs three
rectangles for now, it would be best if the implementations did not
impose any limits (the win32 version is using UT_Vector's).

files: gr_Graphics.h; gr_Win32Graphics.h/cpp; gr_Caret.h/cpp

Tomas

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