Refactored MainWindow to derive from IMainWindow rather than implement a field deriving
from this interface.

Signed-off-by: Konstantina Chremmou <konstantina.chremmou@citrix.com>
Merge branch 'master' of github.com:xenserver/xenadmin
Merge pull request #14 from kc284/master

Refactored MainWindow to derive from IMainWindow rather than implement a field deriving from this interface.