[argyllcms] printtarg feature request: scale gauge

Hi,

Folks often print target improperly scaled targets, because they
forgot to enable "full-bleed printing" for example.

After printing it's often "hard" to tell if it's properly scaled...
Well it's not for me, but it is for some folks.

Maybe it's a thought to print a 1inch/~2.5cm gauge in the target
image, so the user can easily measure it, and see if it was properly
scaled.

Regards,
Pascal de Bruijn

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