add testcase overlappingPlots = ACID(98)
add testcase overlappingPlots = ACID(98)

* be warned: generation of PDF from MATLAB is incorrect (green background missing)
* m2t output will be fixed by PR #371

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