Remove unused classes for the benchmark and update qmcdrivers with the main branch.


git-svn-id: http://qmcpack.googlecode.com/svn@5423 4bc5593c-822e-11de-b41d-d982dfe7be50
Cleanup.


git-svn-id: http://qmcpack.googlecode.com/svn@5424 4bc5593c-822e-11de-b41d-d982dfe7be50
Restore header files in use.


git-svn-id: http://qmcpack.googlecode.com/svn@5425 4bc5593c-822e-11de-b41d-d982dfe7be50