Resolving #631, removing 'using' statements from all header files.
As a consequence, a lot of source files needed fixing up too. There were many cases where source files referred to STL classes but either did not include the cooresponding C++ STL header or did not have a using statement or did not have a 'std::' scope resolution. I added a hook to prevent commits of header files with using statements in them. I added skips for anything in vendor_branches, release and src/third_party_builtin and common/utility/visitstream.h (whose using statements I think define a single symbol name such as cerr or endl). Nonetheless, I still think visitstream.h might bare further scrutiny on this issue. There are a number of other observations I had regarding header file design and usage that I will send to visit-developers in a follow-up email. git-svn-id: http://visit.ilight.com/svn/visit/trunk/src@15352 18c085ea-50e0-402c-830e-de6fd14e8384
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