Workaround for Cappuccino issue #1899 - Highlight state is not reset when item are removed from Menu.
HypervisorNetworks - Added Contextual Menu on tableview

Added also Sender detection.
XIB : Change Popover to transients.
HypervisorNetworks - Fix the contextual menu for DHCP/Host reservation

(we can't use the model defined in TNModule as this controller is not a
module).
HypervisorNetworks - Use CPImageInBundle
HypervisorVMCasts - Added Contextual Menu on tableview and ButtonBar refactoring
HypervisorVMCasts - Use CPImageInBundle and better layout for cell status
HypervisorVMSchedule - Added Contextual Menu on tableview and ButtonBar refactoring
Agent-Action-Scheduler - display min and sec in 2 digits
HypervirsorVMSchedule - Better layout for view, and popover