Remove warnings 'warning: narrowing conversion of ‘mist::to_current_endian(const mist::byte_array<T>&, bool) [with T = unsigned int](((int)from_little_endian)).mist::byte_array<T>::get_value<unsigned int>()’ from ‘mist::byte_array<unsigned int>::value_type {aka unsigned int}’ to ‘mist::dicom::difference_type {aka int}’ inside { } is ill-formed in C++11 [-Wnarrowing]' and 'warning: unused parameter ‘psrc’ [-Wunused-parameter]'