Updated HV Bias Control button to go back to Start
Updated slow control initialization buttons to check the crate power first.  Need to change qdebug message to msgbox
Updated buttons to recognize if relevant channel on crate is on.  Changed initialization button to set the ids of the micros before initializing
split hvcontrol to address turning on bias by cartridge separately - note: not flexible for future cartridges
changed the setHV for the bias voltage to deterministic on/off from toggle
added function to get the slot power status from the floating board for the cartridge
controls for hvfloating board slots now check for state of board during construction to give appropriate display
Added Check for interface for hvbias controls
fixed bug in state of hv floating board slots, added check for slot power to initialization of hv
Updated usbconnections to display whether they were connected or not
added check for usb interface for sc micro initalization
added slot to update the usbconnections interface every second
split out usbconnection class from usbconnections header
split out code from usbconnection header file