use serendipity tetrahedron and haxahedron to compute high order interior vertices (instead of "unusual"... and now inexistant face-saturated incomplete element)

clean up high order routines by refactoring high-order tet/hex/prism/pyram generation code

Hex and Tri ReferenceSpace: load a serialized version if available - if not build a new reference space and serialize it for next time

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allow multiple view selection in option window + changed "link" logic to make it much easier to modify options for several views at once

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