Issue #3135

Olivier says we should try to not be the same as the possible value
for not existing entries.

This is a better fix than the previous one for the local-files-missing bug
because it does not depend on the sync run to run fully through.

A comment should descibe the code, and not a patch.

Unused variables

This fixes t2.pl

We have not received any grave bug reports for it, not needed anymore.

Fix 22c35c4d

However, the fix breaks Qt4 compile, so it needs to be ifdefed.
Not viel hilft viel.

* Change the textedit-empty text to be just "Password"
* Hide the 'Copy link' button when the share isn't created yet
* Show the checked and disabled 'Password required' checkbox
  when a password is required.

In some situations the .lock file would stay around and
cause subsequent starts of the client to get stuck before
showing the ui.

Normally we never ask twice for the same url, but in the setup wizard
it makes sense to do so.

For remote renames that are replicated locally the _file member is
overwritten by the target file name when the new entry is added to
the metadata table. Using _originalFile here guarantees that
the affected local file is mentioned.