added: warn if doxygen version "1.7.3" is detected, it crashes building        the docs
added: warn if doxygen version "1.7.3" is detected, it crashes building
       the docs

git-svn-id: b504d20b1860c4dab5f6fc5ca22923154e6ffb67@2517 4683daeb-ad0f-0410-a623-93161e962ae5

jondo2010/OpenSG,jondo2010/OpenSG,jondo2010/OpenSG,jondo2010/OpenSG,jondo2010/OpenSG