Base: modernize C++: use default member init

src/Base/Reader.cpp

@@ -56,9 +56,7 @@ using namespace std;
 // ---------------------------------------------------------------------------
 
 Base::XMLReader::XMLReader(const char* FileName, std::istream& str)
-  : DocumentSchema(0), ProgramVersion(""), FileVersion(0), Level(0),
-    CharacterCount(0), ReadType(None), _File(FileName), _valid(false),
-    _verbose(true)
+  : _File(FileName)
 {
 #ifdef _MSC_VER
     str.imbue(std::locale::empty());