WIP: FSM notified when a command is finished.

When there is an error, the FSM must make sure that the ongoing cmd flag
is cleared.
Fixed various valgrind-reported issues
Some more valgrind-related fixes.
Remove duplicated block of code in check_tizonia.c
Removed unnecessary trace messages from tiztcproc.c
Fixed initial rm database generation
libtizonia: Temporarily disabled all tests except for one
Reverted temporary changes in check_tizonia.c
Added test_rcfile_get_unexistent_value
Updated renderer alsa devide to use "sysdefault"

#define ALSA_PLAYBACK_DEVICE "sysdefault"
Another test, using alsa pcm plughw:0,0
Another buildbot test: trying pcm 'plughw:Dummy,0'
Another for headless buildbot test: trying pcm 'default'
buildbot test: trying 'null' pcm
ALSA pcm is now configurable via tizrc config file
Use tiz_state_to_str () instead of tiz_fsm_state_to_str () in unit tests