Merge branch 'fix/mc-face-curve' into 'master'
fix/mc-face-curvature The face curvature of elements was not being considered by meshconvert in relation to the spatialdomains element type. Therefore when considering the validity of elements in terms of positive jacobian, meshconvert was identifying large numbers of element which were invalid as valid. This has now been fixed. I have tested this against other parts of nektar (fieldconvert/solvers) and everything now agrees on which elements are invalid or not. Also a small amount of tab clear up. See merge request !511
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