added multi distributions and XCALIBU capacities:

* multi dist: user can define many distributions, they will be sum to create counter data.
* XCALIBU: user can give a calibaration file in config to load TABLE or POLYNOMIAL calib as distribution.
3 jobs for simul_counters in 5 minutes and 14 seconds (queued for 1 second)
Status Job ID Name Coverage
  Style
passed #37352
check_style

00:00:18

 
  Build
passed #37353
create_doc:reference

00:04:55

passed #37354
create_doc:user

00:04:40