Fix InsertRange annotation crash #87
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Adding annotations to page will crash since ImportExternalPage has already cloned them.
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PdfSharp.Pdf.InsertRange crash if there is fixed annotations.
Crash happen at the end of PdfSharp.Pdf.InsertRange:
page.Elements.Add(PdfPage.Keys.Annots, annotations);since page have already annotations added by ImportExternalPage method. Therefore this seems like potential regression bug.
So use replace instead? Works nicely for me but I have no enough knowledge about PDF format to say should annotations be merged mode intelligently instead?