display full license URL for the currently displayed EULA (bnc#898647)

- include the file name in the URL

- directory listing has been disabled after moving registration licenses
from nu.novell.com to updates.suse.com

- 3.1.51
fixed indentation and exception handling
Merge pull request #91 from yast/eula_URL_link

display full license URL for the currently displayed EULA (bnc#898647)