bug#18732: [PATCHv3] whitespace-mode: add 'big-indent style highlighting big indention

[Ted Zlatanov]

On Fri, 17 Oct 2014 15:16:38 +0200 Michal Nazarewicz <mina86@mina86.com> wrote: 

MN> Add a 'big-indent style to `whitespace-mode' indicating when
MN> indention level is getting too big.  By default, 32 SPACEs and
MN> four TABs are considered many but `whitespace-big-indent-regexp'
MN> can be configured to change that.

Stefan, do you want to push this to trunk or should I?  I think it's
ready but for the one minor typo I noted.

Ted