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added \graphicspath support to \pgfdeclareimage
Motivation for this change
This PR implements support for \graphicspath in \pgfdeclareimage.
Fixes #565.
Checklist
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Thank you for your contribution and your interest in PGF/TikZ! Unfortunately, I cannot merge the PR as is, because it is not compatible with Plain TeX and ConTeXt. But we will pick up your suggestion and implement it in a portable manner.
OK, great.
A more general question: In LaTeX format, should pgf's \pgfutil@IfFileExists respect \input@path as its LaTeX relative \IfFileExists does? This would affect the loading of library/module, .table files, and of course images.