add more to color testing reference

added a reference for colors

added a reference for bowtie quadrilaterals

split header tests into their own file

use a bigger threshold in the determinant test

replaced the collinear test with a new one based on the hairline test that checks interior angles against official limits of 0.025 and 179.9

bump year in license

(0) -100 -30 -10 -7 +7 +10 +30 tip

mercurial