Merge pull request #28 from FHenry/3.4

work together
update done customer provider
add description research
upgrade folder "accountingex"
modif sql
Customer Ventilation
Supplier and Customer Ventilation upgrade
update sql
add bookkeeping sql
Add informations
Merge pull request #30 from aspangaro/3.4

Add informations
import account and page presentation
error lignes supplier
Merge branch 'Upstream/3.4'
Le plan comptable choisi influence la page admin/account et tentative de dessin d'un icone :)
Merge pull request #31 from aspangaro/3.4

Plan comptable / Icone / langs
Correction et Grand Icone pour les thèmes
Correction et Grand Icone pour les thèmes 2
readme
Merge pull request #32 from aspangaro/3.4

Grand icone pour les thèmes