Standardize tab width variables across major modes

[Andrew Pennebaker]

Many Emacs modes seem to obey tab-width, e.g. (setq-default tab-width 2). But a few modes define their own variables for this:

* _javascript_ https://github.com/mcandre/dotfiles/blob/master/.emacs#L251

* CSS https://github.com/mcandre/dotfiles/blob/master/.emacs#L252

* Python https://github.com/mcandre/dotfiles/blob/master/.emacs#L256

* Rust https://github.com/mcandre/dotfiles/blob/master/.emacs#L262

* Go https://github.com/mcandre/dotfiles/blob/master/.emacs#L266

* Erlang https://github.com/mcandre/dotfiles/blob/master/.emacs#L274

* Haskell https://github.com/mcandre/dotfiles/blob/master/.emacs#L277
* PostScript https://github.com/mcandre/dotfiles/blob/master/.emacs#L284

* Mozart/Oz https://github.com/mcandre/dotfiles/blob/master/.emacs#L287

Could we refactor these modes to use the standard variables tab-width, indent-tabs-mode, and sws-tab-width? We can maintain backwards compatibility by continuing to offer nonstandard variables like js-indent-level, by deriving them from the standard variables.

... could we refactor sws-mode to derive sws-tab-width from tab-width?

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Cheers,

Andrew Pennebaker

www.yellosoft.us