Failing unittest

[Boudewijn Rempt]

We've got a big increase of failing unittests in 4.3:

    projectroot.libs.libkis.tests.libs_libkis_TestDocument
    projectroot.libs.pigment.tests.libs_pigment_TestKoColorSpaceAbstract
    projectroot.libs.pigment.tests.libs_pigment_KoRgbU8ColorSpaceTester
    projectroot.libs.image.tests.libs_image_kis_filter_weights_applicator_test
    projectroot.libs.image.tests.libs_image_kis_transform_worker_test
    projectroot.libs.image.tests.libs_image_kis_cage_transform_worker_test
    projectroot.libs.brush.tests.libs_brush_kis_imagepipe_brush_test
    projectroot.libs.image.tests.libs_image_kis_layer_style_projection_plane_test


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