Make Dolphin's SortFilterProxyModel for KDirModel public

[Nick Shaforostoff]

From
int KDirSortFilterProxyModel::naturalCompare(const QString& a, const QString& b):

    // This is based on the natural sort order code code by Martin Pool
    // http://sourcefrog.net/projects/natsort/
    // Martin Pool agreed to license this under LGPL or GPL.

So we now have only Dominic Battre left.

Cleaned up version of the patch is in the attachment.
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