HelpDown: new Far help rule syntax, removed option CenterRule, projects use AnyCPU

git-svn-id: http://farnet.googlecode.com/svn/trunk@804 adbc6c76-2828-0410-9a29-2134f03e8e62
PSF 5.0.66, HelpDown to NuGet

git-svn-id: http://farnet.googlecode.com/svn/trunk@805 adbc6c76-2828-0410-9a29-2134f03e8e62