OpenSystemsDevelopment / qpdf

This is a massive rewrite of the help text and cli.rst section of the
manual. All command-line flags now have their own help and are
specifically index. qpdf --help is completely redone.

Also remove linearization from qpdf-manual.pdf. It's a small file, and
removing the dependency on the qpdf executable significantly shortens
build times.

We need to run qpdf --show-crypto.

Update documentation to reflect that automatically generated files are
committed. Detect when they are outdated if we have the ability to
regenerate them.

This creates a zip file of the files that are present in a source
distribution but not present in the repository.

Rather than checking consistency of libqpdf.map, generate it.

This target creates autofiles.zip from a source distribution or fresh
checkout after autogen.sh has been run.  The resulting zip can be
unzipped over a fresh checkout to support easier building on Windows
from a clean checkout.

LARGE_FILE_TEST_PATH -> QPDF_LARGE_FILE_TEST_PATH
SKIP_TEST_COMPARE_IMAGES -> QPDF_SKIP_TEST_COMPARE_IMAGES

Provide option to show test output if requested.

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do not install .la files


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