Wim Haeck

Fixes #250

Fix for #253

There appears to be a difference in the uncertainties calculated for O16 mubar using JENDL4 MF34 data. See the attached input files and pdf files. [J40.O-16.nj16.mf34.pdf](https://github.com/njoy/NJOY2016/files/6778489/J40.O-16.nj16.mf34.pdf) [J40.O-16.nj99.txt](https://github.com/njoy/NJOY2016/files/6778492/J40.O-16.nj99.txt) [J40.O-16.nj16.txt](https://github.com/njoy/NJOY2016/files/6778493/J40.O-16.nj16.txt) [J40.O-16.nj99.mf34.pdf](https://github.com/njoy/NJOY2016/files/6778494/J40.O-16.nj99.mf34.pdf)

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4

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