First step of cleaning up the view properties: inheriting of viewproperties does...

First step of cleaning up the view properties: inheriting of viewproperties does not work with the current approach of directoryviewpropertysettings.kcfg (2 nodes would be required for each directory, only one is used at the moment). Therefor the valid_for_subdirs property has been removed and the implementation model will be adjusted to match 1:1 to the users model. TODO: improve the viewpropertiesdialog be able to apply viewproperties recursively to sub directories.

svn path=/trunk/playground/utils/dolphin/; revision=610383