OpenSystemsDevelopment / qpdf

Be explicit about the need to keep the source QPDF object around.

When requested, QPDFWriter will do more aggress prechecking of streams
to make sure it can actually succeed in decoding them before
attempting to do so. This will allow preservation of raw data even
when the raw data is corrupted relative to the specified filters.

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