- calculate context.REQUEST only one and use `request` as variable name everywhere
- there were old code assuming that if the action is an "object_report" category, we should always redirect to take the forced skin into account, instead check if we have a forced skin, and use changeSkin to keep going with the same request without the need to redirect.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@18428 20353a03-c40f-0410-a6d1-a30d3c3de9de