Draft: Fix for too long names

Closed Florian Bury requested to merge fbury/inference:master into master

Problem appeared when I tried to produce multiple (many) gof in one plot, error was

ERROR in TPDF::Open: Cannot open file:/afs/cern.ch/user/f/fbury/work/inference/data/store/PlotMultipleGoodnessOfFits/hh_model__model_default/multidatacards_a68c3886f7/m125.0/poi_r/saturated/dev/multigofs__poi_r__params_r1.0_r_gghh1.0_r_qqhh1.0_kl1.0_kt1.0_CV1.0_C2V1.0__freqtoys__t500_500_500_500_500_500_500_500_500_500_500_500_500_500_500_500_500_500_500_500_500_500_500_500_500_500_500_500_500_500_500_tpb10_10_10_10_10_10_10_10_10_10_10_10_10_10_10_1.pdf

The problem appeared that ROOT had issues producing a PDF with such long name.

Crude fix was to cutout the string at max length of 250 below which there was no problem, obviously this could be refined but without deeper insight into the code I cannot offer better at the moment.

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