Some CategoryFactoryImpl optimizations

[dotjorgeu]

getParents(Categorizable child) hits catCache.getParents(child) that's great

then if we want to filter by relation_type we don't getParents(Categorizable child, String relationType)

I think we should call getParents(child) that will use cache and then filter by relationType in another list and return it.

I see the same with getChildren getChildren(Categorizable parent) hits cache but getChildren(Categorizable parent, String orderBy) don't getChildren(Categorizable parent, String orderBy,String relationType) don't

We can call getChildren(parent) that hits cache and in a copy of the list filter and sort.

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