[cl-pdf-devel] PNG images support code

[Dmitri Ivanov]

Hello,

This is a new code contribution supporting images in PNG format.
In brief:

1) Suggestion of the sample-image class and the make-image generic.
2) PNG-related primitives and functions.
3) Example code and images.

Additionally, the pdf-name function is needed: I offered it earlier in
thread "Named destinations proposal and small amendments".

The resulting pdf-file is exposed at
     http://lisp.ystok.ru/code/ex-png.pdf

Please test.
--
Sincerely,
Dmitri Ivanov
lisp.ystok.ru
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