TODO for next versions : 
- 

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Version 1.0.x
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1.1.0	- Add datas "moyenne" and "nbvotant" in database concours_result. Export theses datas in csv.
		- add method of rank calculation in a concours (in database).
		- generate the result (export) with the method (moyenne or sum)
1.0.0 --> First public release
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Version 0.0.x
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0.0.1 --> Initial version (for testing)