[MERGE] various style and code improvements, and overly broad exception handlers fixes
[MERGE] various style and code improvements, and overly broad exception handlers fixes

akretion/openerp-web,havt/openerp-web,akretion/openerp-web,havt/openerp-web,havt/openerp-web,havt/openerp-web,akretion/openerp-web,havt/openerp-web