[MOD/IMP] Configuration wizard : Usability Improvements

addons/account/wizard/account_vat_view.xml

addons/association/profile_association.xml

addons/base_setup/__init__.py

addons/base_setup/base_setup_data.xml

addons/document_ics/document_ics_config_wizard.py

addons/event/__openerp__.py

addons/profile_tools/installer.py

addons/profile_tools/misc_tools_installer.xml

addons/purchase/wizard/purchase_installer.xml

addons/sale/sale_installer.xml

addons/thunderbird/installer.py