Merge remote-tracking branch 'origin/develop_integration_w34' into develop

Summary of changes:

- USRP driver improvements (GPSDO handling, GPIO for TDD)
- multi-UEs scenario improvements, mostly the MAC scheduler
- mobipass standalone driver
- bug fixes for VCD tracing code
- some cleanup in the installation scripts
- some work on the T tracer

To use the GPSDO with the USRP device (notably B210), use the
command line argument: --gpsdo-clock