changed to only fork a thread if number of rows in spreadsheet is > 500 (so small spreadsheets don't have to wait for status page's first update if<5 seconds)
LDEV-1261 improve import user speed by running in separate thread (bypass hibernate filter), and update browser with progress every 5 seconds so it doesn't timeout.
login_page_path shouldn't be static final if it includes 'Configuration.get(EARDir)', since a sysadmin may need to change value of EARDir; show error if can't write to login.jsp based on path in EARDir
