[FIX] reporting: change the way that para style are computed
[FIX] reporting: change the way that para style are computed

  - we now compute generic style (i.e. inside <styles/> tag) only once
    at the begenning of the report.
  - for each <para/> tag we encounter, we first try use generic style, and
    we only make a deepcopy() of the style structre, in the case there is
    some style customization directly on the tag

MarkusTeufelberger/openobject-server,vnc-biz/openerp-server,gisce/openobject-server,ovnicraft/openerp-server,splbio/openobject-server,gisce/openobject-server,splbio/openobject-server,ovnicraft/openerp-server,MarkusTeufelberger/openobject-server,vnc-biz/openerp-server,MarkusTeufelberger/openobject-server,xrg/openerp-server,splbio/openobject-server,gisce/openobject-server,xrg/openerp-server