OpenSystemsDevelopment / qpdf

For non-encrypted files, determinstic ID generation uses file contents
instead of timestamp and file name. At a small runtime cost, this
enables generation of the same /ID if the same inputs are converted in
the same way multiple times.

This is a cosmetic change since both are accepted.

Detect a missing page range and assume 1-z.

s/Controls handing of object streams./Controls handling of object streams./

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

Use --encryption-file-password, if given, in addition to --password as
a source for passwords for files specified in --pages.

3.0.rc1

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