VMM: fixed guest hangs when restoring VT-x or AMD-V saved states/snapshots

VMM: fixed memory allocation issues which can cause VM start failures with VERR_PGM_MAPPING_CONFLICT error

VMM: fixed host crashes/hangs on certain 32 bits Windows systems when running Linux guests (bugs #1606, #2269, #2763)

XPCOM/Main: fixed synchronization bug caused by SYSV semaphore key collisions

ATA: fixed deadlock when pausing VM due to problems with the virtual disk (e.g. disk full, iSCSI target unavailable)

iSCSI: fixed possible crash when pausing the VM

iSCSI: fix PDU validity checking and detect final PDU reliably

VBoxHeadless: really don't start X11 services (clipboard service, 3D acceleration; Solaris & Darwin hosts only; bug #3199)

Networking: fixed issue where a VM could lose connectivity after a reboot

Linux hosts: fixed occasional kernel oopses (bug #2556)

Solaris hosts: fixed high CPU load while running many guests in parallel

Solaris hosts: fixed inability to start more than 128 VMs

Solaris/Web services: fixed SMF script to set home directory correctly

Linux Additions: fixed occasional file corruption when writing files in O_APPEND mode to a shared folder (bug #2844)