restore old behavior of GenerateVector(string, vector<string>)
by adjusting the parser as suggested by douglas
"old" means pre-parseutils cleanup, e.g. 0e69efe9
old before now
"" 0 1 0
"," 0 2 0
",," 0 3 0
"a" 1 1 1
",a" 0 2 0
"a," 1 2 1
",a," 0 3 0
"a,b" 2 3 2
"a, b," 2 3 2
fixes #83 (closed)