Improve printshop-ready PDFs

We have had to hand-make a number of technical improvements to Bloom PDFs in order to have them accepted by commercial printshops (documented here). It would be excellent if the Bloom PDF creation routine could incorporate these, either by default or as toggle options. Specifically:

1. Create a bleed of 5 mm
2. Increase the size of the page by 10 mm on all sides, in order to accommodate printer marks
3. Add printer marks to all pages
4. Convert all colors to CMYK
5. Save the PDF as PDF/X-4 format, with a “GWG 2015” (or other appropriate) profile

In addition, one client required b/w or grayscale-only pages to be encoded as “100% Black” rather than 4-color “rich black”.

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