minor fixes to UE

fix incorrect path setting to gen_nvram_path and conf_nvram_path in build_oai
fix typos in codes
fix incorrect system-frame-number / subframe-number display in wireshark logs
allow showing thread-name in printing out the LOG_X()
normalize PDSCH constellation display with respect to channel magnitude, allowing to observe a clear 64QAM constellation even when magnitude of channel coefficients are varying in time
add missing printf() for few run options already supported