[wip] hermite triples
[wip] Hermite triple product
several triple fixes, produces some untested reasonable output now
setup tensor operator and matrix
[wip] setup tensor operator test
[wip] tensor operator
[wip] tensor operator
[wip] tensor operator
[wip] tensor operator
added scipy sparse matrix conversion
[wip] Legendre triple product
[wip] Legendre triples
some modifications in EGSZ2 marking
Merge branch 'sgfem' of https://github.com/SpuqTeam/spuq into sgfem

Conflicts:
	src/spuq/math_utils/multiindex.py
	src/spuq/sgfem/legendre_triple.py
	src/spuq/sgfem/tensor_operator.py
	src/spuq/sgfem/test/test_hermite_triple.py
	src/spuq/sgfem/test/test_tensor_operator.py
some corrections
tensor product runs through now
[wip] some progress in the computation of the pce matrices
Improved output of typechecker (added file and parameter info).
Added ScipyOperator and conversion to it from FenicsOperator
Changed TensorVector to abstract base, implemented MatrixTensorVector