Adding code+settings for changing redirection after publish
(re-merge PR from julfabre to current master : https://github.com/ezsystems/ezpublish-legacy/pull/340 )
fix CS remark.
Adding some exmplanations about RedirectAfterPublish in site.ini settings.
Refs https://github.com/ezsystems/ezpublish-legacy/pull/698
Merge pull request #698 from ballinette/PR-340-redirectpublish

Implement EZP-21385: Support for configurable redirection after publish