[GB.POPPLER]
* NEW: Default resolution is now the same as the poppler library (72 DPI).
* NEW: PdfDocument: Add Max and Index.Max property.
* NEW: PdfDocument: Add Keywords, CreationDate and ModificationDate properties.
* NEW: PdfDocument: Add Linearized and Version properties.
* NEW: PdfDocument: PdfDocument.Index returns the document index as an read-only array of PdfIndex objects.
* NEW: PdfIndex: Action property returns the detail of the action associated with an index entry.
