updating the Documentation (internship of Jean Balmon)

DCT_Documentation/DCTDoc.cls

DCT_Documentation/common/acronyms.tex

DCT_Documentation/f_example.tex

DCT_Documentation/functions/gtPreprocessing.tex

DCT_Documentation/functions/gtSetup.tex

DCT_Documentation/user_manual/ForwardSimulation.tex

DCT_Documentation/user_manual/General_introduction.tex

DCT_Documentation/user_manual/Indexing.tex

DCT_Documentation/user_manual/Matching.tex

DCT_Documentation/user_manual/Reconstruction.tex

DCT_Documentation/user_manual/Segmentation.tex

DCT_Documentation/user_manual/Visualization.tex

DCT_Documentation/user_manual/titlepage.tex