Page Comparison

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1. Attempt to get a file from with an unknown fileID. 
   
   1. An error should be returned informing the user that no pillar contributors is able to deliver the file.
2. Attempt to get a file from an unexisting collection.
   1. Should get an error immediately from the client.
3. Attempt to get a file from a pillar, which does not exist.
   1. Should get an error immediately from the client.
4. Attempt to get a file from a checksum-pillar.
   1. The pillar should deliver a negative response.

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