empty the list. Also added an erase method to Map that works on keys
rather than itterators.
git-svn-id: svn://anonsvn.kde.org/home/kde/trunk/kdesupport/taglib@572681 283d02a7-25f6-0310-bc7c-ecb5cbfe19da
and make the return type semantics consistant for methods that modify
the object (specifically, return a reference instead of void).
git-svn-id: svn://anonsvn.kde.org/home/kde/trunk/kdesupport/taglib@460002 283d02a7-25f6-0310-bc7c-ecb5cbfe19da