OpenSystemsDevelopment / qpdf

Also move tests to libtests.

ClosedFileInputSource is an input source that keeps the file closed
when not reading it.

Specify qpdf libraries before external ones.
Specify LDFLAGS before libraries.
This should eliminate remaining cases of qpdf builds favoring
previously installed versions.

Make sure to link from the source tree before linking from the system.
In many environments, this is necessary to allow a newly built qpdf to
link properly instead of trying to link or resolve libraries from an
older installed version.

Additional testing is added in later commits to be supported by
additional changes in the library.

Preparing to refactor some pattern searching code to use these instead
of their own memchr loops. This should simplify the code that replaces
PCRE.

Add new RandomDataProvider object and implement existing random number
generation in terms of that.  This enables end users to supply their
own random data providers.

Implemented pipeline around sph sha calls using standard test vectors
for full-byte values.  Did not test or support partial byte values.

git-svn-id: svn+q:///qpdf/trunk@868 71b93d88-0707-0410-a8cf-f5a4172ac649

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