Re: apropos commands for commands, user options, all functions, all variables

[Richard Stallman]

    * Define an `apropos-function' command that works for all functions, not
    just commands.

There is no need for it.  You can use plain apropos when you want that.

    * Rename `apropos-variable' to `apropos-option'.

    * Define a new `apropos-variable' command that works for all variables, not
    just user options.

It is a bit of an anomaly that `apropos-variable' works only for
user-option variables.  On the other hand, most users are not
interested in any others.  I'd say just define `apropos-option'
as an alias.

    Similarly, we should rename `set-variable' to `set-option' and define a new
    `set-variable' command that sets any variable, not just a user option.

There is no need for such a command; it would be wasted complexity.
We could define `set-option' as an alias for it.