fixed crashing problem
Fixed crash problem with several nodes
Merge branch 'master' of https://github.com/CosyVerif/webclient
Merge branch 'master' of https://github.com/CosyVerif/webclient
Merge branch 'master' of https://github.com/CosyVerif/webclient
Merge branch 'master' of https://github.com/CosyVerif/webclient
Merge branch 'master' of https://github.com/CosyVerif/webclient
Added login and logout changes with javascript and sessionStorage