Added better results (35% instead of 5% speedup) to reorder.c observed on Arun's laptop with faster RAM, bus etc than my netbook.

git-svn-id: svn+ssh://svn.r-forge.r-project.org/svnroot/datatable@1073 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Merge branch 'refs/heads/r-forge-git-svn-local'