[MERGE] c++-refactor HttpHdrCc

Hi,
  the attached bundle refactors the HttpHdrCc into a c++ class,
attempting also to clean the code up. Main changes:
- 6 less global functions in protos.h
- 1 less struct in structs.h
- proper c++ construction/destruction semantics, standard MemPool integration
- name->id header parsing now done via std::map instead of iterating
over list: complexity should go from O(n) to O(log n) with STL-derived
libs.

Could you please review it?
Thanks

-- 
    /kinkie