Modification of picture part: simplification functions

Signed-off-by: Aurélien Veillard <aurelien.veillard@univ-tlse3.fr>
s
Simplifying by using sub-functions in openpicture.c

Signed-off-by: Aurélien Veillard <aurelien.veillard@univ-tlse3.fr>
Final simplification before implemantation of comparison between descriptors.

Signed-off-by: Aurélien Veillard <aurelien.veillard@univ-tlse3.fr>
Update description of functions in each file.

Signed-off-by: Aurélien Veillard <aurelien.veillard@univ-tlse3.fr>
Add doxygen informations in all files.

Signed-off-by: Aurélien Veillard <aurelien.veillard@univ-tlse3.fr>
Add Aurelien modification into the project

Merge branch 'master' of https://github.com/Sub028/Indexation

Signed-off-by: Jean-François Erdelyi <jean-francois.erdelyi@univ-tlse3.fr>

Conflicts:
	Indexation/config.conf
	Picture/Sources/histogram.c
	Picture/Sources/main.c
	Picture/Sources/openPicture.c
	Picture/Sources/picture.h
	Picture/Sources/quantification.c
	Picture/makefile