fix move in codecmodel
fix move in codecmodel

We were removing and inserting an item instead of just moving it
That confused the selection in the UI.

This fix is only applied for windows because the gnome and osx clients
don't yet support the layoutChanged signals which are emitted when move
operations are performed on the source models of proxy models.

Change-Id: I6a62164231e44f3894d300b3445c781ed8062cbd
Tuleap: #933

savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc