Generator FitExperiment all rcscales

- Add: Generator for FitExperiment randomly sampling ratio, sigmax and both rc_scales.
SubmitPBS improved running jobs counter

- Add: Running jobs number now support jobname filtering. So if you provide different jobnames, concurrent random submissions with max_jobs_queued can run and not interfere with each other. PBS version has a jobname limited to 16 characters. SLURM is cool and works perfectly with any name.
Generator for FitExp random rc_scales, with other statistics extracted

- Add: Generator for FitExperiment, random sampling of ratio, sigmax, rcscales. Also sample from the experimental datapoints, fitting the Mixture model, getting precision and fisher info.