[saveas] Template for the driver options
[saveas] updates to default values

updates to ui and help
[saveas] Cleanup for Save As GUI

Add options to aliased vectorfilewriter drivers
[saveas] UI changes
[saveas] Hide senseless options for sqlite
[saveas] changes to default sqlite/spatialite values
Merge pull request #1000 from matthias-kuhn/filewriter

Visual candy for the "Save as" GUI