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Float precision was causing problems for decimate, small faces that create a nearly flat surface were detected as having no 'cost' to collapse.
When calculating quadrics, using the first-vertex isn't correct.
FLT_EPSILON was too small to use when checking if the edge collapse result is an error. add invert_m3_m3_ex(), invert_m3_ex() functiosn which take an epsilon to check the determinant, saves calculating it twice per edge collapse.
