Set a confirm message for all save file dialogue
Add a method to custom the width of the dialog message
Enable overwrite confirmation by default
Remove unused methods.

300px looks like a good width to me.
Merge origin/master into fix/saveFileSQLConsole
Merge agouge/confirm-overwrite-544 into fix/saveFileSQLConsole
Merge pull request #571 from ebocher/fix/saveFileSQLConsole

Confirm overwrite everywhere a file may be overwritten.

Fixes #544.