first version of new disk usage graph
style fixes in disk usage chart
fixed pie labels in disk usage chart
fixed bug with decimal commas in disk graphs
replaced prototype for jquery includes in captiveportal cgi
removed some prototype includes
removed suprefluous JS includes
better parameters for Zentyal.stripe
users TreeView WIP
common base for TreeView and DataTable

and added unit tests
Merge branch 'jag/migration-js-to-jquery' into jacalvo/multiou
temporary workaround for inconsistent naming
fixed users/groups retrieval
added changelog entries