[FIX] calendar: remove useless code for virtual ids
[FIX] calendar: remove useless code for virtual ids

- remove rml report service virtual id support
- remove useless ir.model wrapper ir.model has never used virtuel ids even in
  2009

optima-ict/odoo,sysadminmatmoz/OCB,microcom/odoo,Elico-Corp/odoo_OCB,laslabs/odoo,Elico-Corp/odoo_OCB,optima-ict/odoo,mkieszek/odoo,laslabs/odoo,stephen144/odoo,ygol/odoo,stephen144/odoo,ygol/odoo,bplancher/odoo,sysadminmatmoz/OCB,syci/OCB,stephen144/odoo,storm-computers/odoo,microcom/odoo,hip-odoo/odoo,laslabs/odoo,syci/OCB,mkieszek/odoo,dfang/odoo,laslabs/odoo,dfang/odoo,ygol/odoo,dfang/odoo,microcom/odoo,stephen144/odoo,hip-odoo/odoo,Elico-Corp/odoo_OCB,hip-odoo/odoo,optima-ict/odoo,optima-ict/odoo,bplancher/odoo,Elico-Corp/odoo_OCB,bplancher/odoo,ygol/odoo,microcom/odoo,hip-odoo/odoo,mkieszek/odoo,sysadminmatmoz/OCB,bplancher/odoo,microcom/odoo,dfang/odoo,Elico-Corp/odoo_OCB,microcom/odoo,ygol/odoo,mkieszek/odoo,stephen144/odoo,storm-computers/odoo,storm-computers/odoo,hip-odoo/odoo,sysadminmatmoz/OCB,optima-ict/odoo,ygol/odoo,mkieszek/odoo,laslabs/odoo,syci/OCB,Elico-Corp/odoo_OCB,bplancher/odoo,stephen144/odoo,dfang/odoo,syci/OCB,sysadminmatmoz/OCB,storm-computers/odoo,storm-computers/odoo,hip-odoo/odoo,ygol/odoo,mkieszek/odoo,sysadminmatmoz/OCB,storm-computers/odoo,laslabs/odoo,syci/OCB,bplancher/odoo,sysadminmatmoz/OCB,optima-ict/odoo,syci/OCB,dfang/odoo