Comment 15 for bug 1659229

Latest patch from Mc (comment 11,12) tested successfully on Ubuntu 14.04.5 LTS and OS X 10.7.5 with lp:inkscape/0.92.x r15346.

TODOs for 0.92.1:
* Code review.
* Text review by UX experts, users (mailing list).

TODOs for 0.92.2:
* Indent the secondary level of radio choices (for physical output).
* Shrink dialog size when collapsing expanded sections.
* Support non-gui invocations via command line (export to SVG and other formats).
* Enforce stay-on-top state for dialog on all platforms (cf. Clip Art import dialog).

The new command line options provided by the patch have been summarized in comment 1 of
* Bug #1659489 “Add command line options for dpi change”
  https://bugs.launchpad.net/inkscape/+bug/1659489
I propose to discuss details about the implementation of the command line options separately in bug #1659489.