Update math/arpack-ng to version 3.1.4
Update www/mathjax to version 2.2
Update math/gretl to version 1.9.13
Tweak devel/sdts++ version 1.5.1_3
Tweak math/qtiplot version 0.9.8.9_5
Update ports-mgmt/portmaster to version 3.17.3