make Cactus::info_format steerable

The pull request

https://bitbucket.org/cactuscode/cactus/pull-requests/84/rhaas-decode-info-format/diff

extends what was already started in git hash 787d6356 "Cactus: Delay decoding the Cactus::info_format parameter" of cactus and makes the info_format parameter steerable. It removes a static variable into which the parameter is currently decoded into at the price of having to do a couple of strcmp each time CCTK_Info is called.

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