Apply update from QtGroupingProxy.

commit 42febf5 from https://gitorious.org/qtgroupingproxy/qtgroupingproxy
Call endRemoveRows in reverse order as begin...

This is a hack, because beginRemoveRows() should always be followed
by endRemoveRows() before the next remove. But since QAbstractItemView
uses a stack to apply changes it works with those. Might break proxyies
though.

Fixes QVector crash in QSortFilterProxyModel with Qt debug builds.




FIXED-IN:2.6