More config file madness add intersection to group operations

[Andreas Ericsson]

John P. Rouillard wrote:
> 
>      web_servers, &production_tier_1, &boston, &https_server
> 
> is a lot clearer than:
> 
>      web_servers, !production_tier_2, !production_tier_3, !test_tier_any, !dev_tier_any, !orlando, !miami, !london, !http_only
> 

After looking at both these suggestions after a 4-day coding session, I can only
say I'd expect

	!!production_tier_2, *test_tier_any

to be a perfectly valid syntax. Perhaps it's just me, but is +- really that bad?

-- 
Andreas Ericsson                   andreas.ericsson at op5.se
OP5 AB                             www.op5.se
Tel: +46 8-230225                  Fax: +46 8-230231

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