v841 - 13th of May

Technical changes and bug fixes
[list][*]Asymptote(f) plots same as Asymptote(f(x))[/*][*]CAS input doesn't duplicate by clicking the AV[/*][*]Invert()[/*][*]JavaScript scripts using Sandbox[/*][*]x_1 doesn't change to x'1[/*][/list]

Information: v841 - 13th of May