unexpected error handled; format/extension fixed; improved Url intelligence

Signed-off-by: Floyd Pink <imbleedingme@googlemail.com>
logout clears preferences

Signed-off-by: Floyd Pink <imbleedingme@googlemail.com>
won't write metadata file if none are selected from Preferences

Signed-off-by: Floyd Pink <imbleedingme@googlemail.com>
fix twoway synching list; cancel on pref window takes back to login window

Signed-off-by: Floyd Pink <imbleedingme@googlemail.com>
added title to prefs window; added a checkbox to metadata listbox

Signed-off-by: Floyd Pink <imbleedingme@googlemail.com>