OpenSystemsDevelopment / qpdf

Using search and replace.

Remove any ambiguity around whether old or new value is being
returned.

Change .clang-format and commit automated changes from a fresh run of
format-code

Run this:

for i in  **/*.cc **/*.c **/*.h **/*.hh; do
  clang-format < $i >| $i.new && mv $i.new $i
done