do not overwrite proof-shell-quit-timeout by default (final PG 4.1 supposedly gets it right);

--- a/etc/proofgeneral-settings.el	Sun Jan 23 13:28:10 2011 +0100
+++ b/etc/proofgeneral-settings.el	Sun Jan 23 16:29:10 2011 +0100
@@ -3,7 +3,8 @@
 ;; Examples for sensible settings:
 
 (custom-set-variables '(indent-tabs-mode nil))
-(custom-set-variables '(proof-shell-quit-timeout 45))
+
+;(custom-set-variables '(proof-shell-quit-timeout 60))
 
 ;(custom-set-variables '(isar-eta-contract nil))