[KPhotoAlbum] Bug 150972 - change "no other" behavior when selecting directories

[Johannes Zarl]

Hi,

While digging into the mentioned bug, I reorganised the "No Others" Image 
Matcher:

0001-Replace-NoOtherCategoryMatcher-with-ExactCategoryMat.patch
0002-ImageSearchInfo.compile-omit-empty-andMatchers.patch
0003-Remove-NoOtherItemsCategoryMatcher.patch
0004-Remove-unused-code-from-DB-ExactCategoryMatcher.patch

You can also apply this alone (which just fixes Bug 150972):
0005-Make-No-other-work-for-sub-categories.patch

I know this is a realatively large changeset for little actual change, but let 
me make a stance for the new code:
 + There is no longer a CategoryMatcher.finalize() step involved:
   This means one less iteration over the whole matcher tree.
 + shouldPrepareMatchedSet is only set for those parts of the matcher tree 
where it is actually needed
 + mixing "No other" in different categories now works correctly
  E.g.: "FolderA / **No other** / PersonB / **No other**"

Cheers,
  Johannes
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