Test tva
Merge pull request #10 from etiennefontaine/master

Test tva
Corrections of input_variables and test_tva
correst thes tests
Merge pull request #11 from etiennefontaine/master

correst thes tests
replaced numbers by the equation
Merge pull request #12 from etiennefontaine/master

replaced numbers by the equation
droit d accise alcool
Merge pull request #13 from etiennefontaine/master

droit d accise alcool
corrected the tests and parameters
Merge pull request #14 from etiennefontaine/master

corrected the tests and parameters