IDP private PDF compatibility pipeline, revision 1

This package contains the IDP raster driver and a private PDF conversion
runtime. PDF jobs use the same bundled conversion code whether the system
has libcupsfilters 2.1.1 or 2.2.1. No system libcupsfilters files are replaced.
The private runtime is scoped to this model and is removed with it.

Runtime: libcupsfilters 2.1.1, libppd 2.1.1, QPDF 11.9.1.
Ghostscript, CUPS and their standard shared libraries come from the system.
Licenses and upstream notices are included under the private runtime folder.

Install: sh install.sh
Requires x86-64 Linux, CUPS 2.x with classic PPD filters, Ghostscript,
Python 3 and the standard shared libraries reported by the install check.
Existing queues with this model's raster filter keep their settings and
receive the PDF filter entry. PPD backups are kept under /var/lib/idp-driver.
Do not print during installation or removal because CUPS is restarted.

Validation limits: built and software-tested on Ubuntu 18.04. A comparison
environment simulates both libcupsfilters versions; this is not a complete
Manjaro installation qualification. See the accompanying validation report
for hardware results and remaining model-specific checks.
