bug#43300: [PATCH] Make M-x show new commands for obsolete aliases

[Juri Linkov]

unarchive 43300
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> Please find attached two patches that tweaks how M-x
> (execute-extended-command) works:
>
> 1. Show obsolete commands, and give their new name as an annotation.

I noticed that some commands have " (nil)" appended as annotations
in M-x completions, e.g. 'M-x browse- TAB'.  Looks like " (nil)"
is returned in read-extended-command--annotation:

          (obsolete
           (format " (%s)" (car obsolete)))