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

- never open the message console automatically, it's just to annoying and very slow when there are many errors
- indicate that there's been an error in the status bar
- make it easy to show/hide the messages by a single clic on the status bar
- report the first (not the last) error in the status bar if the messages are not shown

Feedback is welcome... (We can always revert to the old way if necessary ;-)

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fixes Ticket #161