[IPP] Updated Safe G-Code White Paper posted

[Michael Sweet]

All,

I have posted an updated interim draft of the "Safe G-Code Subset for 3D Printing" white paper to:

	https://ftp.pwg.org/pub/pwg/ipp/wd/wd-sweet-safe-gcode-20180416.docx
	https://ftp.pwg.org/pub/pwg/ipp/wd/wd-sweet-safe-gcode-20180416.pdf
	https://ftp.pwg.org/pub/pwg/ipp/wd/wd-sweet-safe-gcode-20180416-rev.pdf

This draft addresses feedback and adds registrations of IPP attributes and a MIME media type.

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Michael Sweet, Senior Printing System Engineer