Strengthen modifiers test validation, from D7397.

Submitting on behalf of Jesse Y (deadpin).
In test harness for modifier testing, now run mesh validation
on output mesh. Also, fix printing so it interleaves properly.

Merge branch 'master' into newboolean

Strengthen modifiers test validation, from D7397.

Submitting on behalf of Jesse Y (deadpin).
In test harness for modifier testing, now run mesh validation
on output mesh. Also, fix printing so it interleaves properly.

Fixed Newboolean bug: how face sides were tracked.

Also, being more paranoid about new BMesh elements changing
positions in their tables after creating new elements, so
copying them all first.

Fix T74800 Bevel modifier generates vertex group weight > 1.0.

Due to floating point approximations, the weights for interpolating
the mdeformvert layer could add up to a tiny bit more than 1.0.
This was not a problem in practice, but the mesh validation routine
used in regression tests was testing for this and therefore failing.
Just changed interpolation of mdeformverts to clamp max to 1.0f.

Merge branch 'master' into newboolean

Fix a syntax error in test spec for BLI_delaunay_2d_test.

Test specs are read from strings, and there was a comma instead
of a decimal point, and then an extra decimal point in the Quad0 test.
This test has been flaky on Windows buildbot. Perhaps this is why.

Fix crash in debug newboolean due to repeated vertex.

Boolean: fixed case where example came from new edge.

The code keeps track of which edges are to be used for examples,
and missed a case where the split edge was a new one so shouldn't
have an example.

Merge branch 'master' into newboolean