Added / Corrected SQL Server DDL

Corrected SQL Server DDL:
* auctionmark
* wikipedia

Added SQL Server DDL:
* chbenchmark
* voter

I had also creates SQL Server DDL for SIBENCH, but had issues when running on RHEL 6.x. Something to do with the fact that the benchmark name is SI (capitalized). Ran fine on both Windows and OS X. I tried several variations for the filename, none of which seemed to work. So I removed the file and may return to it later.