Display error messages from startup problems in web client
If the BASE web client fails to start Tomcat will simply respond with a
404 The requested resource is not available error message.
More detailed information about the startup problems can usually be found in one of the log files. Though it is not always easy to find the correct log file.
It would be nice if some information about the startup problem could be displayed directly in the web client. A typical error is that after a database schema update:
Schema version mismatch: database schema version=131; expected=132; Please update the database with the 'updatedb.sh' script before starting BASE.