stylistic changes
allow to show the annotation namespaces in the grid
don't show exception whenever the service is not running
hide progress bar when the result did not return any matches
updated documentation to close #348
fixed #330 ("_c" parameter lost if corpus needs login)
fixex #338 (arch_dependency visualizer does not scroll)
don't show login message if there is at least one corpus available
make twin column select wider
better handling of login/logout in the administration UI
handle exceptions when not logged in
init "isLoggedIn" state of the controllers at init time
more robust exception handling
add "expires" member to Usre
adding some code to display the expiration date
allow to manipulate existing expiration dates
allow the expiration to be disabled completly
fix #350 (AQL normalization fails for node with two outgoing edge annotations)
fix #350 (AQL normalization fails for node with two outgoing edge annotations)
update version to 3.1.8