Update math/sc to version 7.16_3
Update math/py-apgl to version 0.8.0
Update misc/esniper to version 2.29.0
Tweak math/libRmath version 3.0.2_2
Tweak math/libR version 3.0.2_2
Update misc/excel-writer to version 13
Tweak math/ruby-gnuplot version 0.5_6
Update math/R-cran-Zelig to version 4.2.1