Allow a job to be added without configuration file

[maxwelltsai]

Make SiMon behaving as a job submission system, so that if the users have a few jobs, e.g., jobs/python job_1.py, jobs/python job_2.py, dir/my_prog.exe, then the jobs submitted with

simon -c "jobs/python job_1.py"
simon -c "jobs/python job_2.py"
simon -c "dir/my_prog.exe"

Without the need of using ic_generator to generate directories and config files whatsoever.