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Fixed intersection of metrics. Improved intersection of mesh metrics deriving from characteristic lengths.

memory leak + force recompute MaxPointNum, MaxLineNum & co after each Merge so we can easily append gmsh entities to other CAD models in the GUI

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New homology command "Betti" to compute just the Betti numbers of the given domain and relative subdomain. It is always somewhat faster than computing (co)homology basis.

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- make getAdditionInfo display main meshAttributes

bad parametrization can lead to bad results. Yte, this
implementation is FAST and, in the case of bad parametrization
optimization should be used 

(soupir)

second part to previous patch: never ever start with the console visible; General.MessageSize now just specifies size when it is visible