Option arrays -> `opts_...` functions defined
Option arrays -> `opts_...` functions defined

Old functions `addToOptions`, `merge` and `prettyprintOptions`
have deprecation warnings but are still used

RPeschke/matlab2tikz,okomarov/matlab2tikz,miscco/matlab2tikz,PeterPablo/matlab2tikz,matlab2tikz/matlab2tikz,egeerardyn/matlab2tikz,okomarov/matlab2tikz,LJeub/matlab2tikz,egeerardyn/matlab2tikz,matlab2tikz/matlab2tikz,nidrosianDeath/matlab2tikz