Based on patches from Nicolas Thauvin.
Changes:
* bookmarks for all overlays
* corrected bug preventing correct use of \cite in slides with overlays.
* corrected reinitialization problem of the current color when
option "colorlinks" is true
* Now, counters are not incremented inside overlays. Added macros to support
this. Labels should no longer reported multiply defined in overlays either.
* Prosper now supports Adobe distiller for transforming PS files into PDF
files
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