More test cases for cep2sparql.
Testing CEP2SPARQL/EPA2 with new policies.
Added tests and isolated queries for cep2sparql EPA5-7.
Fixed (hopefully) a problem in remove-token for exists-start/end-node. The code for exists-start-node called remove-token for children of exists-end-node  even, when add-token never was called for the same token. Further, remove-token did not check, whether the token already was removed, because we expected that this would not be possible. There may still be problems with this code
Added files that were used for debugging EPA1
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Added trie.lisp
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Updated readme to point to wiki for instructions, removed the older PDF-file.
Merge branch 'master' of https://github.com/aaltodsg/instans
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Merge branch 'master' into parallel-instans