Improve configuration module error management at init time, Fix command line help option processing, remove shotopt field from parameter structure

Fix configuration module shared library improperly build and not loadable when libconfig version is below 1.5

push 2 hours ago just before i retrieved the branch...

lte-softmodem -O <config file> will trigger legacy config mode
ltesoftmodem  -O libconfig:<config file> will trigger configuration module usage.

- carrier->MIB will be reused, so "spare" has to be allocated
- wrong parameters sent to uper_encode_to_buffer

added configuration file for nFAPI PNF (oaiL1) and modifications in startup procedure to initialize L1 only. When executed, it just waits for configuration, which will never come ... Provides and initial framework to integrate NFAPI PNF modules.

addition of MPDCCH format 5. X_u_br sequences for BL/CE UE support and bugfixes in rx_prach0 for eMTC.