fix command line parsing for config_getlist, also improve help processing and fix probe (opt) parameters processing

exit softmodem when a command line option requiring an argument is specified without an option value. Previous behavior was to print a message and ignore the option

For whatever reason most of the files had their permission
changed from 644 to 755, which is not wanted.

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Add a parameter to load_configmodule API to allow an exec to specify that it may be run with only  command line options

fix bad build_oai directive to compile libconfig for phy-simulators, fix load_configmodule crash because config source not set.

abort execution when an unknown option is passed via the command line: add config_check_cmdlineopt API to config module, create lte-softmodem-common.c source to remove duplicate code in lte-softmodem.c and lte-uesoftmodem.c, fix segfaults in exec_function of lte-uesoftmodem

removing reference to uesoftmodem from load_configmodule (don't understand why this dependence is there in fist place. Also makes unitary sims break)

Using valgrind revealed that those two arrays
were too small. Let's use 512 bytes, which should
be enough for every practical cases.

Use common log mechanism in layer 3, mapping specific macros to common ones and extending common log utilities to support specific layer3 requirements

log.c simplification, fix usefull functionality which never worked, move all log code from openair2 to common

2. minor modifications in dlsch_demodulation.c for 2 eNB TX antennas, 1 RX antenna. Inconsistant indexing of some arrays in this case.
3. change in config_load_configmodule.c : removed exit(-1) when no configuration file is used. This makes unitary simulators exit. Effect on lte-XXsoftmodem TBC.

Log review step 1: legacy VCD removal, LOG macro modified, TTracer enabled at build time by default, in a way it, by default configuration,  provides console logs, as in previous versions