Add "1 byte" text singular.

Signed-off-by: Boris Barbulovski <bbarbulovski@gmail.com>
Implement update dialog showlog button event.
Remove svn neon library.

As of svn 1.8 neon library is removed (https://subversion.apache.org/docs/release-notes/1.8.html#compatibility)

Signed-off-by: Boris Barbulovski <bbarbulovski@gmail.com>