Fix NodeDensity+log10, add test

...enerators/nlojet++/interface/check/fnlo-compare-tables.py

v2.5/generators/nlojet++/interface/data/check/Makefile.am

...ors/nlojet++/interface/data/check/fix_lgx_NodeDensity.str

...ors/nlojet++/interface/data/check/fix_lgx_NodesPerBin.str

...ors/nlojet++/interface/data/check/fix_slx_NodeDensity.str

...ors/nlojet++/interface/data/check/fix_slx_NodesPerBin.str

...rs/nlojet++/interface/data/check/flex_lgx_NodeDensity.str

...rs/nlojet++/interface/data/check/flex_lgx_NodesPerBin.str

...rs/nlojet++/interface/data/check/flex_slx_NodeDensity.str

...rs/nlojet++/interface/data/check/flex_slx_NodesPerBin.str

v2.5/toolkit/fastnlotoolkit/fastNLOInterpolBase.cc