Update to 1.7.

Add CUPS support, cobbled together from the two PRs, plus some
spin of my own.

Add a configure option to speed up the build.

Because of the new options, pkg-plist springs back to life.

Move the portdocs install to the more traditional location.

Update pkg-message to indicate that it is for a non-CUPS world.

PR: ports/54156, ports/60391
Submitted by: Glenn Johnson <glennpj@charter.net>, John Merryweather Cooper <johnmary@adelphia.net>