the new history panel editor has been activated. it is meant to work the same as 
the old editor, with some improvements to the history variables selection page. 
this new version is written in html+javascript and it will be easier to improve, 
update and maintain compared to the old version written in c++. the old history 
panel editor is still usable and accessible by pressing the "edit in old editor" 
button. please report any problem, quirks and improvements in this thread or in 
the bitbucket bug reports. K.O.