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2012-12-31Incorporate sha2 code from sphlib 3.0Jay Berkenbilt
Changes from upstream are limited to change #include paths so that I can place header files and included "c" files in a subdirectory. I didn't keep the unit tests from sphlib but instead verified them by running them manually. I will implement the same tests using the Pl_SHA2 pipeline except that sphlib's sha2 implementation supports partial bytes, which I will not exercise in qpdf or our tests.