Fixed indentation and some comments
Added getDistributionCollection, getMatrix and getConstant methods to the python distribution class
Changed name of test script. Added a new test (comparison with a RM). More comments and better organization of tests. Ongoing work
Added setDistribution method, used by the init constructor
Added computeCharacteristicFunction method. Needs validations
[tests]: added validation of computeCharacteristicFunction
[src] : added src folder to make separate sources and documentation