Cleaning script
Moving begin/end dates datas extraction from Python to C++ files

* Added function to Utilities for string fill
* Moving python type check from Python to C++ in 'setPeriodBeginDate'
Modifying all type parameter in wrapper.cpp to boost python object, and added type check method in c++ side
Updating docstring in c++ wrapper
Updating docstring in c++ wrapper
Breaking loop for test creation in cmake file into custom test for each test script
Adjustement of c++ source files of 80 characters max per line
Cleanning c++ sources files

* Adjustement of c++ source files of 80 characters max per line
* Deleting namespace convert and function related
Merge branch 'devel-pyof' of https://github.com/VaysseB/pyopenfluid into devel-pyof
Cleaning python script and adding description to PyOpenFLUID library
Modifying PyOFException class to accept new parameter : Type of the exception raised
* Deleting empty or useless python script files
* Modified inclusive rule '__*' to '*py'
Cleaning sources files - removed functions and classes no longer used
Improving tests of observers paths