[IPP] [PWG5100.12] Issue #75: Need to update/remove specifications, attributes, and operations

[msweet at apple.com]

[Issue Unconfirmed]

This is a placeholder for a future update of PWG 5100.12.

We need to update all of the specification references.

We also need to remove deprecated or obsolete attributes, values, and
operations.

Also consider removing any specifications that do not contain required
items (e.g. PWG 5100.7).

Link: http://www.pwg.org/issues/75