issue #20254: added usrext table
Merge remote-tracking branch 'BENDIY/20254-global' into 20254-globalfold
Merge pull request #388 from shackbarth/20254-globalfold

issue #20254: added usrext table
issue #20254: removed gui scripts
issue #20254: wrote table and orm for usrext
issue #20254: added user account extension assignment box
enforce user extension loading
define core-relevant privileges in the core
added translation
change your own password
admin change user password: client-side
overriding backbone save for user_account
Merge remote-tracking branch 'XTUPLE/20254-global' into 20254-globalfold
merge with ben
Issue #20254 consolidate assets into sessionless static file server.