multiple page selections don't seem to work in tryton-GTK{2,3} clients
as indicated in #6955 (closed), there is a problem when the number of account lines in an account (for example from Open Accounting Plan->Accounts) depasses client.limit (default=1000) lines and the selection spans lines on multiple page.
Currently, the lines selected before going the the next page are simply dropped from the selection, making it impossible to e.g. reconcile these lines, which is unacceptable. (the reconcilation wizard is near unuseable)
Also, the lines selected, and the status line indicated the lines selected should be *always* correct (#3703)