Remove some entries from the default exclude list.

If the user really want to have those entries excluded it can add them
manually.
But one cannot change the default so if user want the .bak files synced,
he would not be able to do it

sync-exclude.lst

@@ -1,6 +1,5 @@
 *.filepart
 *~
-*.bak
 *.part
 *.crdownload
 
@@ -17,10 +16,6 @@ csync_journal.db.ctmp
 desktop.ini
 
 *.kate-swp
-*.aux
-*.nav
-*.out
-*.toc
 
 *_conflict-*
 ]*.~*