Export records does not work for larger set of records

[blcham]

Alternative solutions:

• 1) retrieve IRIs first and then retrieve Entities
• 2) add support for page-ing
  • we will notify the user that he wants to export too many records
  • possible to export that many
• 3)reimplement using memory store
  • first load all contexts to the memory store and then query it from the store
• 4) do not use JOPA at all but rather queries