[Bf-python] improvements to HotKeys Reference Help script

[jmsoler at free.fr]

Selon jmsoler at free.fr:

> Hotkeys is my project since years and would like to continue to
> manage it without to have to remove the not needed or not
> wanted "improvments".
>

And it seems that your text browser script does not respect the GPL
licence. You borrowed 90 % of my original script and you pretend that
it is just "based on". GPL suppose that you could add to the original
sources not that you consider it like yours.

jms