Scaled histogram weights and better EtaCorrection sigma range.

In ToolBox.py:
- in FindSigmaMin, increased the search range because bias scans need larger sigmas

In pyEudetAnalysisOnly.py:
- commented out SetBatch by default, since it changes shapes of saved histos
- set Sumw2 for scaled TOT histograms, so they can be fitted with correct error bars