Add binary support

[porteri]

Add binary I/O support using Fortran 2003's access="stream"

TODO:

• Move formatted write statement to DT IO
  • attributes
  • cells
  • datasets
• Move formatted read statement to DT IO
  • attributes
  • cells
  • datasets
• Write unformatted write statements
  • attributes
  • cells
  • datasets
• Write unformatted read statements
  • attributes
  • cells
  • datasets