Hi all!

This is my first attempt to implement -symbol-info-symbol and
-symbol-list-functions. 

It's not meant to be committed already, but I'm just wondering whether
I'm using the correct functions, coding style and output. Should I
really use search_symbols for these kinds of things? It seems a little
inefficient to use a function that does regex matching when supplying 
a 'normal' symbol name (and it might have some issues as well with 
names that contain special regex characters).

Jelmer