Fixes bug that after duplicate entry error, there is always an duplicate error although the data is correct
Adapts test data to reflect more cases without using the sub-products
Displays no articles of selection products in list view

This was the case when no category or text for searching was available
Merge pull request #365 from nsendetzky/master

Displays no articles of selection products in list view and adapts test data
Fixes saving categories for selection products multiple times, optimizes the number database requests
Optimizes index rebuild performance and fixes tests
Merge pull request #369 from nsendetzky/master

Fixes saving categories for selection products and optimizes index rebuild performance
Removes old SVN version headers
Merge pull request #370 from nsendetzky/master

Removes old SVN version headers
Merge pull request #360 from doleiynyk/2013-12-03_Saving_items_after_exception_fails_fix

Fixes left over list entry in admin interface when a new item couldn't be stored
Optimizes catalog index creation and adapts unttest data
Merge pull request #371 from nsendetzky/master

Optimizes catalog index creation and adapts unttest data
Optimizes the catalog index rebuilds for 100000+ products
Merge pull request #373 from nsendetzky/master

Optimizes the catalog index rebuilds for 100000+ products
Revert "Optimizes the catalog index rebuilds for 100000+ products"

In theory it should have been faster but in practice it takes longer to use the catalog IDs in the catalog list search
Minor performance improvement
Merge pull request #374 from nsendetzky/master

Reverts optimizations as they improve performance only in theory