Use ecl_set_option instead of patching to disable ECL_OPT_TRAP_SIGCHLD
test that no SIGCHLD handler was installed
Fix the random space that sometimes appears in Maxima pexpect output
removing dead code
Merge branch 'u/vbraun/ecl_signal_beautification' into develop
Merge branch 'u/vbraun/maxima_random_space' into develop