VirtualBox 5.0.16.105871

- VMM: fixed a problem which could lead to a wrong guest behavior on AMD CPUs
- GUI: don't try to synchronize the HID LEDs if the VM window is not active or if it's minimized
- GUI: prevent a crash during startup under rare conditions
- GUI: sub-menu option to disable the guest-OS type overlay in the application dock icon on Mac OS X
- GUI: position off-screen windows to be fully visible again on relaunch
- GUI: hide the VT-x/AMD-V checkbox if raw-mode is not supported
- PC speaker passthrough: new experimental feature, available on Linux host only
- Audio: several fixes for Mac OS X hosts + guests
- Audio: properly handle default audio device changes
- USB: serveral fixes for the xHCI controller (e.g. for webcam passthrough)
- BIOS: fixed int15/AH=83/AL=00 function
- iPXE: enable the HTTP download protocol on non-Linux hosts
- Shared folders: fixed a failure to load the saved state under certain circumstances
- Guest Control: added support for (cached) Active Directory authentication in case the domain controller is not reachable
- Serial ports: raised the number of serial ports per VM from 2 to 4
- Serial ports: fix for the TCP/IP backend (Windows hosts only)
- SDK: make the Python webservice API binding work again
- Seamless mode: fixed a crash under certain circumstances
- Linux hosts: fixed the /sbin/rcvboxdrv script as well as the missing shebang in two scripts
- Linux hosts: properly uninstall Python files installed by the .run installer
- Windows hosts: hardening fix required for recent Windows insider builds
- Windows hosts: fixed Python installation path
- Windows hosts: support MTU larger than 2 KB with bridged networking
- Windows hosts / guests: properly sign binaries using a sha-256 certificate
- Windows Additions: fixed guest property enumeration of logged-in users
- Windows Additions: fixed sporadical failure of the graphics driver in Windows 10 guests
- Windows Additions: under rare circumstances no mouse movement events were delivered to the guest