codec: Fix the GSM 06.20 ordering tables

Seems the script I used to parse those had a bug where range of
bits in the 'decreasing' direction ( like 6..0 ) were not processed
properly.

Thanks to Andreas for noticing this !

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
cygwin: Link many libraries with -no-undefined to create a dll

Only the Gb library relies on having undefined references to a
symbol that needs to be provided by the host application. For
all other libraries we can link with -no-undefined.
utils: Introduce OSMO_ASSERT in the utils and use it in the unit tests

The tests should unconditionally assert, regardless of debug settings.
This uses the OSMO_ prefix as it's in the global namespace.
logging_vty: Print 'log filter all' info in 'show logging vty'

When we print information about the current logging configuration,
it makes sense to also print information about the log filters.
gsm_septets2octets(): Input parameter should be const
Add smpp34_osmocom.h for Osmocom SMPP vendor additions
add new gsm/meas_rep.h file for shared/common measurement report stuff
logging: add new log_targets_reopen() function

This function will re-open all existing log files in the application,
praticularly useful for SIGHUP handlers in case of logrotate
application: don't ignore SIGHUP but do config file reopen.
Revert "Fix log level "everything" and make it equal to "debug""

This reverts commit cd6ed82d1ff48f47ad9e33e6322df62896a76ed5.
Revert "Follow up fix for the log level "everything""

This reverts commit a6428d2376034d619f342897d3ce415b3f9a3584.
logging_vty: Fix segfault un unused entries in log_info_cat array of app
utils: Use fprintf to print the assertion and generate a backtrace

This is changing the semantic of the assert. The regression tests
now either need to check the stderr result, the exit status or print
a message when all tests are completed.

This is not that bad as the osmo_generate_backtrace is printing to
the stdout right now.
tests: Verify that all tests exit with status=0.
gprs_ns: Allow to set the DSCP for the UDP socket.

Allow to tag the NS service with a custom DSCP.
debian: Start a new release cycle with libosmocore 0.6.0