vita: changed CHDR format to use bytes
usb: added logging capability w/ env var
b100: moved usb wrapper class into b100 impl
uhd: packet handler minor changes
usb: squashed thread related changes
usb: useful error messages on failed submit
usb: added timeout param and additional queries
uhd: added new calls to streamer object + support work
Merge branch 'maint'
uhd: switch the reusable barrier to condition variables
This allows the converter threads in a multi-threaded streamer to wait quietly.In addition, the use of two barriers in the packet handlers was reduced to one,by adding a simple exit barrier inside the reusable barrier's wait method.
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