added two more svg modes that have no transparency and suitable for tee-shirt printing#77

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sballe73 wants to merge 7 commits intofukuchi:masterfrom sballe73:master

+638-27

Commits on Sep 24, 2015

added a fancy svg mode that does as described in fukuchi#69
sballe73
committed

Commits on Oct 22, 2015

added two more svg modes that have no transparency and suitable for teeshirt printing
sballe73
committed

Commits on Aug 9, 2023

aligned with upstream
sballe73
committed