nicer code
New methods for tracing a job given its site, localID and date-time
improve time slot, add relevant attributes to result
add possibility to request a list of attributes from jobs when tracing
batch jobs
few more code simplifications
add optional parameter for tracing jobs (until)
Merge pull request #1883 from phicharp/Changes-v6r11-140326

[v6r11] Changes 140326