* DiscImageChef/Main.cs:

* DiscImageChef/Options.cs:
	* DiscImageChef/DiscImageChef.csproj:
	* DiscImageChef/Commands/DeviceInfo.cs:
	  Added "device-info" command.

	* DiscImageChef.Decoders/SCSI.cs:
	  Correct size miscalculation.
	Do not print "Device claims no standard", generates too much
	  noise.

	* DiscImageChef.Devices/Device/Constructor.cs:
	  Add OS error detection and handling.
	On Linux move to opening O_RDONLY and O_NONBLOCK to allow
	  opening read-only media and removable drives without media.

	* DiscImageChef.Devices/Device/Variables.cs:
	* DiscImageChef.Devices/Device/ScsiCommands.cs:
	  Add OS error detection and handling.

	* DiscImageChef.Devices/DiscImageChef.Devices.csproj:
	* DiscImageChef.Interop/DiscImageChef.Interop.csproj:
	  Downgraded .NET version.

DiscImageChef.Devices/Device/Variables.cs

@@ -44,6 +44,8 @@ namespace DiscImageChef.Devices
     {
         Interop.PlatformID platformID;
         object fd;
+        bool error;
+        int lastError;
 
         /// <summary>
         /// Gets the Platform ID for this device
@@ -78,6 +80,30 @@ namespace DiscImageChef.Devices
             get;
             set;
         }
+
+        /// <summary>
+        /// Gets a value indicating whether this <see cref="DiscImageChef.Devices.Device"/> is in error.
+        /// </summary>
+        /// <value><c>true</c> if error; otherwise, <c>false</c>.</value>
+        public bool Error
+        {
+            get
+            {
+                return error;
+            }
+        }
+
+        /// <summary>
+        /// Gets the last error number.
+        /// </summary>
+        /// <value>The last error.</value>
+        public int LastError
+        {
+            get
+            {
+                return lastError;
+            }
+        }
     }
 }