Renamed TypeReflection::isAssignableFrom() to isPtrAssignableFrom
Improved implementation of TypeReflection::isPtrAssignableFrom()
Improved "Value::typedPPtr<T>() const" to work also with parent types
Removed non-templated FormatString::universalPrint and universalToString

Non-templated versions were cause trouble with perfect forwarding of
const values.
Changed RootIO interface to use std::string instead of TString
Removed unnecessary c_str conversions