add base_url override to notebook
Access Control now works + fixed booboo in conf

* linted and ver_pick'd the access control nav tree
* web_ui.Tree fix to correctly use parent node
* wrong button handling in configuration fixed
Merge pull request #766 from mfalesni/booboo

Access Control now works
Made set_server_roles return if already matched
Merge pull request #770 from psav/fix_server_roles

Made set_server_roles return if already matched
Fix tree locators
Merge pull request #768 from dajohnso/notebook_tweak

add base_url override to notebook
Merge pull request #772 from psav/fix_tree

Fix tree locators