change to exponential format
change to exponential format

this hopefully resolves issues with both very large numbers (ACID(16)) and small numbers close to `eps` (ACID(28)).

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