Fixed a bug with imported surveys due to missing sid.
Since the sid is created randomly for every new survey I removed the auto_increment on the sid in the creation of the table 'survey'.

git-svn-id: file:///Users/Shitiz/Downloads/lssvn/source/phpsurveyor@1861 b72ed6b6-b9f8-46b5-92b4-906544132732