Avoid to do requests to WikidataQuery when possible

Simplifies cases like [Q42, Q43] ∩ (?, instanceof, human) without requests to WikidataQuery: just check that the items have PropertyValueSnak(instanceof, human).
More aggressive load of entities

Assume that with previous improvements output of MissingSubjectTripleNodeSImplifier will be "small"
Increase the range of trees simplified by MissingSubjectTripleNodeSimplifier

Allows it to simplify (?,a,(b,c,?)) ∩ (?,d,e) with only one WikidataQuery request
Merge pull request #69 from ProjetPP/filter

Improves speed