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Fix for memory leaks

Nico Bergemann requested to merge nb_iti/nektar:fix/shared_ptr_mem_leak into master

The use of shared pointers from elements to their edges/faces and also from edges/faces to connected elements created a circular dependency that meant that memory was not freed. Circumvented by the use of weak pointers in the index from edges/faces to elements. Also, there are circular include dependencies of headers, some of which I also addressed. Note that this revision requires include guards in cadfixapi.hxx.

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