Handling of GUI threading issues is now isolated to the specific
code which updates the dataviews, e.g. self.RowValueChanged(row, col),
instead of running larger blocks of code on the main GUI thread,
which made the GUI feel less responsive.
Disabled some of the unnecessary notebook view features, like
reordering tabs.

Disabled the balloon notifications on the system tray icon,
which say Click Here to acces MyData's Menu, because acknowledging
these notifications requires an extra click which is annoying.