Fix many bugs with the Symbols menu (when run with -d argument).

The Symbols menu is now fully useable.
A much more complete dsy file is included, called combined.dsy.
Generate the Symbols then use the combined.dsy file to identify far more functions.
Too late. If you don't want it renamed then don't complain about not understanding what it does (and the problem really is that you don't understand). I kept the keyboard shortcut the same though.
I'm certainly not going to change what it does though, especially when I wasn't the one who decided what it should do.