Bugfixes/Code improvements provided by C.Scott Ananian/Verified Voting for additional robustness when exporting/importing tab delimited files with vvexport and vvimport. Changes deal with MS Excels oddities handling commas, and add extra functionality when importing, to allow re-using existing id's unless one already exists, in which case it will re-number the entry.

git-svn-id: file:///Users/Shitiz/Downloads/lssvn/trunk/unstable@1226 b72ed6b6-b9f8-46b5-92b4-906544132732