Added DataTableExpressionAdapter for backward compatibility of sortBy-filterBy expressions between 3.x and 4.x.

git-svn-id: https://primefaces.googlecode.com/svn/primefaces/trunk@10036 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
Readd layout attribute to outputPanel. Defaults to block now.

git-svn-id: https://primefaces.googlecode.com/svn/primefaces/trunk@10037 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
Removed unused import

git-svn-id: https://primefaces.googlecode.com/svn/primefaces/trunk@10039 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c