OpenSystemsDevelopment / qpdf

Use get() and use_count() instead. Add #define
NO_POINTERHOLDER_DEPRECATION to remove deprecation markers for these
only.

This commit also removes all deprecated PointerHolder API calls from
qpdf's code except in PointerHolder's test suite, which must continue
to test the deprecated APIs.

Use PointerHolder in several places where manually memory allocation
and deallocation were being used. This helps to protect against memory
leaks when exceptions are thrown in surprising places.

See: https://sourceforge.net/p/qpdf/bugs/17/

Parts of the fix for that bug report had previously been committed in
30dbf94f53a3fd9760242883bdc5bddbaa0c9f44 and
6299c64cf3351fb1935319378aed421e26ed2f90.

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.

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