Create appearance streams for annotations.

Now handles more annotation types, and does not use the pdf-write device.
Handles many of the usual annotation properties, such as border width,
color, interior color, line ending styles.

	* Ink
	* Highlight, Underline, Strike-Out, Squiggly
	* Line (with arrow-heads)
	* Polygon
	* PolyLine
	* Square
	* Circle
	* Caret
	* Text (needs better icons)
	* FileAttachment (needs better icons)
	* Sound (needs better icons)
	* Stamp
	* FreeText

Partially complete:

	* Widget (treats everything like a plain text field)

Not done, but on the to-do list:

	* /BS style (solid/dashed/bevel/inset/underline)
	* /BS dash pattern

Not done and not on the list:

	* Movie
	* Screen
	* Printer's Mark
	* Trap Network
	* Watermark

	* /Border corner radii (ignored by acrobat)
	* /BE cloudy border effect

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