[MlMt] Custom widescreen view with thread arcs

[Mateusz Parzonka]

Hi,

I've made a custom MailMate layout for Mailboxes view. It modifies the 
installed widescreen layout by adding a vertical thread arcs view at the 
right. It has become my standard view which I use on a daily basis.

If anyone would like to try it out: I've created a gist with 
installation instructions: https://gist.github.com/4707302

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Mateusz