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
updating changelog
add regression test for #350
Finish annis-3.1.8
Merge branch 'master' into develop

Conflicts:
	Misc/changelog.py
	annis-gui/pom.xml
	annis-interfaces/pom.xml
	annis-interfaces/src/main/java/annis/model/QueryNode.java
	annis-kickstarter/pom.xml
	annis-libgui/pom.xml
	annis-service/pom.xml
	annis-visualizers/pom.xml
	annis-widgets/pom.xml
	buildbot_scripts/copyService.sh
	doc/Doxyfile
	pom.xml
don't add any permission to user if the account is expired