OpenSystemsDevelopment / qpdf

Also add copyright notice to a few public headers that were missing
one.

off_t is used internally only when needed to talk to standard
libraries.  This requires that the "long long" type be supported by
the compiler.

Significantly improve the code's use of off_t for file offsets, size_t
for memory sizes, and integer types in cases where there has to be
compatibility with external interfaces.  Rework sections of the code
that would have prevented qpdf from working on files larger than 2 (or
maybe 4) GB in size.

… of delete, thus making it useful to run valgrind over qpdf during its test suite

git-svn-id: svn+q:///qpdf/trunk@1051 71b93d88-0707-0410-a8cf-f5a4172ac649

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git-svn-id: svn+q:///qpdf/trunk@846 71b93d88-0707-0410-a8cf-f5a4172ac649

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… for C and C++ interfaces

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git-svn-id: svn+q:///qpdf/trunk@825 71b93d88-0707-0410-a8cf-f5a4172ac649

- Add a way to set the minimum PDF version
 - Add a way to force the PDF version
 - Have isEncrypted return true if an /Encrypt dictionary exists even
   when we can't read the file
 - Allow qpdf_init_write to be called multiple times
 - Update some comments in headers


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git-svn-id: svn+q:///qpdf/trunk@720 71b93d88-0707-0410-a8cf-f5a4172ac649