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Reduce memory use and allocations for some connectivity descriptors

Merged Stéphane Del Pino requested to merge feature/is-on-boundary into develop
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  • Memory use reduction occurs for 1D and 2D
    - In dimension 1 node/edge/face numbers/owner/is_owned share the same
    underlying arrays since node, edge and face are actually the same
    - In dimension 2 edge/face numbers/owner/is_owned share the same
    underlying arrays since edge and face are actually the same
    
    On the way, ItemValue (resp. ItemArray) APIs changed: one can no more
    affect a direct Array (resp. Table). One now must use the new
    constructor that uses a connectivity and an Array (resp. Table). This
    is always a better approach than before since it eventually consumes
    one useless allocation/deallocation.
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