peopleproxy: do no connect to rowMoved when using Qt
peopleproxy: do no connect to rowMoved when using Qt

to rowsAboutToBeMoved too

I ve put a guard on the OS but the real problem is about Qt handling
layoutChanged signal and receiving a duplicate information
(and no longer valid) because of the rowsMoved forwarding necessary
to other platforms client (for now)

Change-Id: I30c2e89067e1fc16124d864f6df3406d678e40d5
Tuleap: #148

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