bug#13276: 24.2.50; apropos-variable

[Drew Adams]

In Emacs, a customizable variable is called an "option".  There is no
other kind of option in Emacs.  The doc refers to such as options, as
do also existing commands and other functions (`customize-option',
`customize-apropos-options', `customize-changed-options',
`whitespace-toggle-options',...)

Emacs 24.4 has introduced the poorly named command and face
`apropos-user-option' and `apropos-user-option-button'.
Please rename these as they should be named: `apropos-option' and
`apropos-option-button'.

Everyone in this bug thread, including RMS, had agreed that the name
should be `apropos-option', but Stefan acted otherwise.  This is a
bad decision.  It just makes things harder for users, by confusing them.