Add a new flag, -e, that makes it possible to give users the ability

to edit files with the editor of their choice as the invoking user,
not the runas user.  Temporary files are used for the actual edit
and the temp file is copied over the original after the editor is done.

sudo.h

@@ -113,6 +113,7 @@ struct sudo_user {
 #define MODE_IMPLIED_SHELL       004000
 #define MODE_RESET_HOME          010000
 #define MODE_PRESERVE_GROUPS     020000
+#define MODE_EDIT                040000
 
 /*
  * Used with set_perms()