Merge pull request #144 from v17al/master

Changing email listed in AUTHOR file
Minor appearance changes
Optimize icon sizes
Release scoped pointer for dialog after show
Fix release dialog pointer
Resize tab bar to full width and height
Show clipboard content changed by other session

If clipboard was changed by other clipboard monitor session, don't add
item to list, only change window title, tray tooltip and pop up
notification.
Hide tab bar/tree if it contains only one entry
Fix item resizing
Fix tests
Allow client to finish after "exit" command
Fix typo
Updated command line help in README.md
Updated translations (completed Czech)
ItemSync: Removed unused constant
Show "restart required" message only if new language differs from current
Windows: Guess symbol key for global shortcut
Jumping to Nth item is no longer supported
CHANGES file updated
Updated AUTHORS file