Add missing \since 5.1 for QVector::takeFirst() and ::takeLast()

Change-Id: Ic2d7e82187a17e21c2ed0e81318294730c3a0930
Reviewed-by: Thorbjørn Lund Martsum <tmartsum@gmail.com>
Revert "Ensure CSS rules are inherited from the parent tags"

Since the original change caused a problem with the CSS
rules being always inherited where in some cases this should
not be happening.

This reverts commit 6f6546613774a48fe12f13f796ed7115dfe49a27.

Change-Id: I6e9cf163d752b1869b5e967a7ab59963d655ba87
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>