configure: Add configuration for addr2line path

 If addr2line utility is found a new configuration parameter
 is defined in config.h
 define ADDR2LINE_PATH "/usr/bin/addr2line"
configure: Add HAVE_ADDR2LINE configuration define
configure: Add configuration for gstack

 If gstack utility is found a new configuration parameters
 is defined in config.h
 define GSTACK_PATH "/usr/bin/gstack"
 define HAVE_GSTACK 1
Add ssa_signal_handler.c
tmp.commit before branch switch
add2line is added
add Copyright
exit->abort. Produce core dump
add configure
conditional include for config.h
fix compilation error if addr2line is not defined
add run_cmd function
print current stack from main
remove command line printing
avoid recursion in case of SIGABRT
parse addr2line output
print a warning message before crash in the tester
comment out using alternative stack
add start_frame to print_stack function
Skip garbage from addr2line output