[TSVN][PATCH]Improve C++ standard compliance

Hi dev,

this patch should be low risk, too, and is required for VC8.0.

[[[
Fix issues found by VC8.0:
* enum values don't reside in the enumeration's scope
  (this is not C# *g*)
* const-correctness issues (especially const char*)
* member function pointers must be constructed using
  the & operator
* use explicit type for bTipPopped in MyGraph.cpp
]]]

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