OpenSystemsDevelopment / qpdf

The latter catches underflow/overflow.

Now that the test suite runs clean with address sanitizer, add some
test cases that previously were used to expose memory errors.

There was a missing free causing a memory leak in some test code. The
memory leak was not in library code.

Resolve link error on cygwin

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

Slightly improve memory cleanup in Pl_DCT
Make it easier to test with valgrind

While scanning the file looking for objects, limit the length of
tokens we allow. This prevents us from getting caught up in reading a
file character by character while digging through large streams.

A stray semicolon caused a condition to be incorrectly applied during
stream length recovery.

Pushing member variables into a nested class enables addition of new
member variables without breaking binary compatibility.

Reduce code duplication