Suggestion: more informative default values

[fgvieira]

Dear all,

I think it would be nice to have some more informative default values for some options:

• job name (--name) default to the script name, instead of xenon
• if a folder provided to --stdout and --stderr, default the file name to (e.g.) {script_name}.o{jobid} and {script_name}.e{jobid}