document the changes that occured since a few months
also display subitems in the changelog

and display the UUID in the about box.
move some stuff out of the overcrowded session menu
disable exporting to the cloud for now
save the user data before closing the PLM on user switch

That PLM shutdown is just not acceptable. We are not on Windows, are we?
try to allow user switching without restarting the PLM (almost working)
preselect the currently used user when switching
further try to get the user switching seamless
remove JAXP jar
remove C compilation for string
add extrema lesson for array
add Golomb Sequence for array
Merge branch 'master' of github.com:gianninou/PLM