Linux: converted XPCOM runtime to a single shared object

Linux: fixed SIGALRM process crash on certain distributions

VMM: fixed Linux guests with grsecurity (address space scrambling)

ACPI: added experimental ACPI support

VRDP: added shadow buffer for reduced bandwidth usage

VRDP: added support for pointer shapes and remote pointer cache

GUI: added support for pointer shapes

Windows Additions: added support for high resolution video modes, including multi screen modes (2, 3 and 4 screens)

VBoxManage: added new command line tool to automate simple administration tasks without having to write application code