IDE: added workaround for Acronis TrueImage (violates IDE specification)

IDE: resolved issues with certain Linux guests

ACPI: further improved host power status reporting

API: fixed several race conditions and improved reliability

API: increased maximum guest RAM size to 2GB (Linux host) and 1.2GB (Windows host)

USB: added option to set the OHCI timer rate

VMM: fixed several issues

VRDP: fixed infinite resize loop

GUI: changed the default host key to Right Control