Merge pull request #3832 from jenshnielsen/norm_deprecated

Remove deprecated nonorm and normalize
Unicode issue on python3
Use open rather than file
python3 whats_new_99_spines
Add Lfunction
Python3 lightness.py
python3 demo_gridspec06
Multiple_yaxis python3
boxplot_demo2 python3
marker_reference python 3 compatible
No need to use xrange for a short loop

fixes python3
Merge remote-tracking branch 'jenshnielsen/examples_python3_fixup' into examples_python3_more_issues