Hello,

The attached patch adds the command `list-keyboard-macros`, which works 
like `list-buffers` using `tabulated-list-mode`.  It allows for 
re-arranging the macros in the ring; editing their counters, counter 
formats, and macro keys; deleting macros in the ring; and duplicating 
macros for further editing.

Please let me know what you think. I followed the naming scheme used by 
Dired for a few of the commands, but don't know if that's best.

Thank you.