Add support for other compilers

[bonanza123]

Currently, it seems that ktikz is indeed only working with pdflatex, it would be nice if support for lualatex could be added. (replacing pdflatex with lualatex results in errors)

[bonanza123]

I guess the reason why lualatex failes has something to do with the LOCALE, running ktikz from commandline (where proper locale is set) works fine with lualatex.