Assign a local downloadURL to scripts installed from the "new script" dialog.
Assign a local downloadURL to scripts installed from the "new script" dialog.

Fixes #1580.

HasClass0/greasemonkey,the8472/greasemonkey,the8472/greasemonkey,Ventero/greasemonkey,Martii/greasemonkey,HasClass0/greasemonkey,Martii/greasemonkey,Ventero/greasemonkey