Increase precision for double output
Increase precision for double output

Let's not lose precision in the InterpolationSurrogateBuilder::write
step to an ASCII file.

roystgnr/queso,roystgnr/queso,briadam/queso,briadam/queso,roystgnr/queso,briadam/queso,roystgnr/queso,roystgnr/queso,roystgnr/queso,briadam/queso,briadam/queso