Fixed python interpreter at first line.
Added new usage and help messages. Also, dropping old command line arguments for new ones.
Migrated script from argparse to ConfigParser
Removed vmstat flag which was incomptaible with debian vmstat.
Changed password error message for execute_non_interactive_ssh_com()
Added port for scp command.
Added scp command existence check and scp copy error check.
Added output_dir option for graphs.
Ignore sar header (disrupts parsing)
1. Added LC_TIME to sar (make parsing algo the same for RHEL and Debian)
2. Added check com killall
3. New parsing for vmstat
4. Vmstat will not output non-existing procs
5. Tweaked sar parsing