new inline DefineNumber[] and DefineString[] onelab parameter definitions; this matches the way we do things in python

* New ENABLE_COMPRESSED_IO option to enable on-the-fly IO with gzipped files (patch from Alexis Salzman)
* New PrintParserSymbols() to print workspace (currently in option window, for debugging puroposes)

useful for remapping a mesh onto a (slightly modified) CAD, for sensitivity analyses

- new DrawForceChanged command to force recomputation of vertex arrays

* New version of Trevor Strickler's QuadTri patch (+ examples in benchmarks/extrude_quadtri)

* First pass at SU2 mesh export

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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

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

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