Enhance reliability

After a reboot to Windows, which had applied a different configuration, I wasn't
successful in reapplying the old settings from within Linux in a reliable way so
that they would be loaded by the device on the next reconnect.  Writing the
configuration twice in a row seemed to help.  This also seems to work.  There
might be some timing or what not behind the issue, I don't know.

The GUI tool is a bit prone to quitting on LIBUSB_ERROR_PIPE on my system at
the moment.  Not very user-friendly.  But I'm tired of inspecting it already,
unplugging and re-plugging in the mouse all the time like an idiot...

README

@@ -28,7 +28,7 @@ $ cmake .. -DCMAKE_INSTALL_PREFIX=/usr
 # make install
 
 Note that there's no "make uninstall" and the GUI needs to be installed in the
-right location to work correctly.
+right location in order to work correctly.
 
 If you don't want the GUI frontend, append -DBUILD_GUI=NO to the cmake command.
 The GUI also isn't going to be built if you don't have the GTK+ 3 development

sensei-raw-ctl.c

@@ -189,8 +189,12 @@ static int
 sensei_set_intensity (libusb_device_handle *device,
 	enum sensei_intensity intensity)
 {
-	unsigned char cmd[32] = { 0x05, 0x01, intensity };
-	return sensei_send_command (device, cmd, sizeof cmd);
+	unsigned char cmd_1[32] = { 0x05, 0x01, intensity };
+	unsigned char cmd_2[32] = { 0x05, 0x02, intensity };
+	unsigned result = sensei_send_command (device, cmd_1, sizeof cmd_1);
+	if (result < 0)
+		return result;
+	return sensei_send_command (device, cmd_2, sizeof cmd_2);
 }
 
 /** Set pulsation speed. */
@@ -198,8 +202,12 @@ static int
 sensei_set_pulsation (libusb_device_handle *device,
 	enum sensei_pulsation pulsation)
 {
-	unsigned char cmd[32] = { 0x07, 0x01, pulsation };
-	return sensei_send_command (device, cmd, sizeof cmd);
+	unsigned char cmd_1[32] = { 0x07, 0x01, pulsation };
+	unsigned char cmd_2[32] = { 0x07, 0x02, pulsation };
+	unsigned result = sensei_send_command (device, cmd_1, sizeof cmd_1);
+	if (result < 0)
+		return result;
+	return sensei_send_command (device, cmd_2, sizeof cmd_2);
 }
 
 /** Set sensitivity in CPI. */