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TeroFrondelius 
Bug/mortar discretization (#88)

* new mortar segmentation tests which are failing

* test_problems_mortar_3d.jl: first test (Tet4) pass

* solvers.jl: diagonal of A is now properly filled, if that option is used. Another option is to remove zero rows from matrix system, which is on by default

* problems_mortar.jl: added new function diagnose_interface to calculate quantities from interface hopefully revealing bugs in calculation

* problems_mortar_3d.jl: added docstring for check_orientation! and removed flooding debug messages not helping to debug anything

* solvers.jl: Another way to solve Ax = b

* Refactored code to make implementation of Tri6 assemble! easier

* Patch test with linear Tet4 elements and quadratic Tet10 elements pass

When using quadratic elements, in polygon clipping algorithm element is divided to linear sub-elements as proposed in [Puso2008]. Interpolation of Lagrange multiplier space is done using quadratic shape functions.

References
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[Puso2008] Puso, Michael A., T. A. Laursen, and Jerome Solberg. "A segment-to-segment mortar contact method for quadratic elements and large deformations." Computer Methods in Applied Mechanics and Engineering 197.6 (2008): 555-566.

* increased coverage by adding diagnose_interface

* test using dual basis, failing for unknown reason

* Fixed dual basis construction for Mortar/Tet4

The coefficient matrix Ae for one particular slave element e is the result performing numerical integration on *all* integration cells associated with this element [Popp2013]. Ae cannot be calculated "cell-wise" like it was done before. Now patch test will pass also using `interface.properties.dual_basis = true` option. Partially integrated slave elements are supported as well.

References
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[Popp2013] Popp, Alexander, et al. "Improved robustness and consistency of 3D contact algorithms based on a dual mortar approach." Computer Methods in Applied Mechanics a... (continued)

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