OpenSystemsDevelopment / qpdf

to avoid line ending problems

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 Detect when they are outdated if we have the ability to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

This is for testing the release process, particularly as it pertains
to AppImage creation.

Bump to an alpha release. This version is not being widely released
but is being used to push the new shared library version through the
debian packaging system and to test out github releases.

We were putting the value of LT_CURRENT in the versioned symbol map
instead of the soname major version, which was creating binary
incompatibility where none was present. Unfortunately, this bug is
already out there for qpdf 7.0.0, so we'll have to work around it for
now.

Most of the README files have been renamed. Refer to the new names.

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

If not available, give an error.  The user may also configure qpdf to
use an insecure random number generator.