Prevent index out of array on checking BeFS with
less-than-sector-size boot sector.
* DiscImageChef/Commands/Checksum.cs:
Corrected checksum calculation for multiple tracks
* DiscImageChef.DiscImages/CDRWin.cs:
Corrected typo in track calculation.
Corrected partition start and length calculations.
* DiscImageChef.Filesystems/BFS.cs:
Corrected decoding fields.
Added supports for boot sector smaller than device size as in
some Be CDs.
* DiscImageChef/Main.cs:
Forgot to define Console.Write()