added menu entry (+ accelerator key) for value reset, + some small menu
cosmetics
updated todo list
fixed small problem with locale when using Country EN
approx. solution no longer needs nonm-linear solver
preparing for V2.1: code cleanup, some renaming of variables, now using
"new simplified math"
housekeeping regarding info txt files
made parts of label text bold, small typo corrected
version 2.1