Changes since 3.1.2:
Bug 526 - Fix linear vectorized transversal in linspace.
Bug 551 - Fix compilation issue when using EIGEN_DEFAULT_DENSE_INDEX_TYPE.
Bug 533 - Fix some missing const qualifiers in Transpose
Fix a compilation with CGAL::Gmpq by adding explicit internal:: namespace when calling abs().
Fix computation of outer-stride when calling .real() or .imag().
Fix handmade_aligned_realloc (affected conservativeResize()).
Fix sparse vector assignment from a sparse matrix.
Fix log(0) with SSE.
Fix bug in aligned_free with windows CE.
Fix traits of Map<Quaternion.
Fix a few warnings (507, 535, 581).
Enable SSE with ICC even when it mimics a gcc version lower than 4.2
Workaround gcc-4.7 bug #53900 (too aggressive optimization in our alignment check)
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