Display more MSSQL statistics on APP page, prevent empty graphs.

Display more of the MSSQL statistics gathered via WMI while preventing the display of empty graphs caused by different versions of MSSQL not all reporting the dame types of data.

Replace html/pages/device/apps/mssql.inc.php with the attached file and remove the html/pages/device/apps/mssql directory as it is no longer needed.

Sorry if there is a better way to submit code, I read the developing guide on the wiki, but it didn't say how to actually submit patches once complete. I am also not familiar with SVN having only even used GIT in the past.