improved def of 0Metamodel/Loop; moved def of 0Metamodel/Batch to a better place; def OL.isChanged(client); improved OL.show(param); plus clean up

communication to the metamoodel of the Gmsh batch and loop status; OL preprocessors returns the /changed/ status of the client; /changed/ flag of all parameters set to false after a /compute/; param attributes updated (not replaced) by a parameter redefinition; + some clean up 

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* 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)

new -setstring and -setnumber command line options (to define parser variables without parsing, like in getdp)

- new DrawForceChanged command to force recomputation of vertex arrays

Fopen deals with non-ASCII filename paths on Windows.

- prepend ./ if necessary
- call python explicitely on the script if the script it not executable

OpenProject does not reset parser variables if we have -string on the command line; otherwise always reset them

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Add gamepad use to navigate into the model. Compiles on MS-Windows but still not works (to be done).

when opening solver files (through file->open or e.g. in the finder) we now perform onelab_cb(reset); I think this is the right(TM) thing to do

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

- 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 ;-)