Example sessions as remote sessions

When filebroker starts, it updates remote sessions from zip files.
Maintainer can login in to client as remote_session_owner and edit the
remote sessions that are then exported to zip sessions to keep them also
up-to-date. Client shows a list of example sessions.
Friendlier warning when example session has disappeared.
Remove obsolete warning about missing example sessions
Fix source code loading in remote sessions
Merge branch 'data_beta' of local repository into example-session

Conflicts:
	src/main/java/fi/csc/microarray/client/QuickLinkPanel.java
	src/main/java/fi/csc/microarray/client/SwingClientApplication.java
Refactorin session urls to uuids