Fix 619 by resolving redirects in SMWExportController

Returns a triple to point to the target with <swivt:redirectsTo rdf:resource= ... />
Update README.md

[skip ci]
SQLStore / Fix subobject redirect access and id mismatch

- Fix null produced by SMWExportController::getSemanticData
- Fix id mismatch in SMWSQLStore3Readers::initSemanticDataCache for when subject has doesn't match
- Avoid redirect subobject resolve in SMWSql3StubSemanticData::getSubSemanticData
Merge pull request #622 from SemanticMediaWiki/rdf-redirects

Fix #619 by resolving redirects in SMWExportController
Update RELEASE-NOTES.md

[skip ci]
Tidy CompoundConditionBuilder::addOrderByData
Merge pull request #652 from SemanticMediaWiki/sparql-tidy

Tidy CompoundConditionBuilder::addOrderByData
Tidy CompoundConditionBuilder::addMissingOrderByConditions
Merge pull request #653 from SemanticMediaWiki/sparql-tidy

Tidy CompoundConditionBuilder::addMissingOrderByConditions