add multithreading to tester
ssa_log.c: Add include <stdio.h> for snprintf and etc. functions
alpha-bet order for includeswq
add stdlib.h include
link to log file
add output file parameter to ssa_print_backtrace
add gstack usage to ssa_print_backtrace
remove gstack usage from main
move addr2line usage under HAVE_ADDR2LIN define
move gstack usage to ssa_print_backtrace_with_gstack
ssa_log.c: Export get_thread_id function from the file
ssa_log.c: Use tid if thread's name is not setted in get_thread_id
add spin lock and thread name
add absent includes
tests: Add access to GNU extention functions to testers.

 All other SSA components (core plugn, ibacm, ibssa)
 are GNU compatible already.
add ssa_signal_handler.c to SSA applications
Add ssa_set_ssa_signal_handler to common.h
start using signal_handler in ibssa
condional compilation