Add debug output to File::create()
Add debug output to File::create()

Make this consistent with resize() and create_tempfile(), so if ftruncate() fails, adding the -debug option should tell which of these functions is failing.

MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3