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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.

- remove error in a:b:c if leads to empty list

Major work on GUI : removed much-hated "menu window" & merged onelab tree in graphic window. Gmsh now requires FLTK 1.3.

(Additional changes: fixed crash when de-minimizing opengl window on mac os ; refactored Msg::StatusBar)

To abort a script, use "Abort"

Better handling of (co)homology computation in selected dimensions only. Various cleanups and documentation of (co)homology stuff.

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Added possibility in homology solver parser interface to select (co)homology space base dimensions to save; Added option to select (co)homology basis physical groups numbers and debug options to HomologyComputation plugin.

fixed nasty bug in quad meshing
added parameters to BL generation (2D)

Make sure to close the files left open (on purpose) in ParseFile when we exit OpenProject or when we call ClearProject.

Leaving the files open can lead to file handle exhaustion, e.g. with onelab when remeshing several hundred times. This then leads to
unpredictable socket errors.