Moved shared pointer includes
The shared and weak pointers are now included via ACGL.hh, this way there is one one central place to replace the pointers if needed (C++11, TR1, boost, own variant). For this, they are placed in a ptr namespace so std:: (C++11) and str::tr1:: (C++98) variants as well as boost and own implementations can all get redirected. C++11 detection added and correct non-tr1 header include added (should make VS2010 porting easier).
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