Start using fixed Mandel notation ordering from Tensors.jl

[TeroFrondelius]

In the new coming Tensors.jl release has an updated tovoight method, which takes the order as an input argument.

See the problem here:

MFrontInterface.jl/src/mfront_material.jl

Lines 67 to 70 in 44ce243

	# now reorder from voigt 11, 22, 33, 23, 13, 12 -> 11, 22, 33, 12, 13, 23
	# and use Mandel notation (scaling with sqrt(2.0))
	# https://en.wikipedia.org/wiki/Voigt_notation#Mandel_notation
	mfront_dstrain = tovoigt(frommandel(SymmetricTensor{2, 3}, [dstrain[1], dstrain[2], dstrain[3], dstrain[6], dstrain[5], dstrain[4]]))

And the solution here:
Ferrite-FEM/Tensors.jl#124