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2018-12-31 Jay Berkenbilt <ejb@ql.org>
+ * Add several methods for flattening form fields and annotations:
+ - QPDFPageDocumentHelper::flattenAnnotations - integrate
+ annotation appearance streams into page contents with special
+ handling for form fields: if appearance streams are up to date
+ (/NeedAppearances is false in /AcroForm), the /AcroForm key of
+ the document catalog is removed. Otherwise, a warning is
+ issued, and form fields are ignored. Non-form-field
+ annotations are always flattened if an appearance stream can
+ be found.
+ - QPDFAnnotationObjectHelper::getPageContentForAppearance -
+ generate the content stream fragment to render an appearance
+ stream in a page's content stream. Called by flattenAnnotations.
+ - QPDFAnnotationObjectHelper::getAnnotationAppearanceMatrix -
+ calculate the matrix that will transform from the appearance
+ stream coordinates to the page coordinates. Called by
+ getPageContentForAppearance.
+
* Add method QPDFObjectHandle::mergeDictionary(), which
recursively merges dictionaries with semantics designed for
merging resource dictionaries. See detailed description in