Changes

[Enhancement #73] Refactor OntoDriver API descriptors in preparation for supporting multiple contexts per assertion/subject.

AxiomValueDescriptor has been split from AxiomDescriptor, as it can contain only one context per assertion/subject to prevent ambiguity issues when saving values.
 (commit: 6f83773)

[Enhancement #73] Ensure consistent handling of contexts in OntoDriver axiom descriptors.
 (commit: 0912513)

[Enhancement #73] Refactor Sesame driver to support the new plural contexts supporting axiom descriptors.
 (commit: ceeb452)

[Enhancement #73] Test support for multiple read contexts in Sesame OntoDriver.
 (commit: 8e9b4db)

[Enhancement #73] Refactor Jena OntoDriver to support the new axiom descriptors with plural contexts.
 (commit: 6dfdd27)

[Enhancement #73] Testing support for using multiple contexts in assertion loading in Jena Driver.
 (commit: 4aa99d1)

[Enhancement #73] Fix issues with AxiomDescriptorFactoryTest.

Also put Hamcrest into parent pom to make it accessible in tests in all modules.
 (commit: 1f44ba7)

[Enhancement #73] Refactor types OntoDriver API to support multiple contexts. Fix test issues.
 (commit: 9c25a14)

[Enhancement #73] Refactor descriptors to support multiple contexts per descriptor and attribute.

The changes are as small as possible w.r.t. existing API.
 (commit: ada5b96)

[Enhancement #73] Add tests for the updated descriptor behavior, fix issues.
 (commit: c4626b8)

[Enhancement #73] Adapting JOPA impl to the new descriptors API. WIP.
 (commit: 6201470)

[Enhancement #73] Adapting OOM in JOPA to the new descriptor API. Extend Descriptor with methods for getting single context (used for write operations).
 (commit: c68ede8)

[Enhancement #73] Refactor OntoDriver API (and implementations) to support contains call with plural contexts.
 (commit: 8b32ff2)

[Enhancement #73] Use OntoDriver plural context contains API in JOPA.
 (commit: f5129eb)

[Enhancement #73] Working on modifications of second level cache to support plural contexts.
 (commit: e1813dc)

[Enhancement #73] Update second level cache to work with plural contexts.
 (commit: d355dac)

[Enhancement #73] Fix tests after context-related refactoring (WIP).
 (commit: 815f342)

[Enhancement #73] Fix integration tests after plural context changes.
 (commit: f93cd42)

[Enhancement #73] Add integration tests for plural contexts support.
 (commit: 4711b74)

[Upd] Update dependencies (RDF4J 3.4.2, JaCoCo plugin 0.8.6).
 (commit: 1e91d74)

[Upd] Update to RDF4J 3.4.3.
 (commit: f2b6362)

[0.16.0] Bump version and update release notes.
 (commit: 6a58d79)

Initial draft - WIP
 (commit: d8ba832)

Changed metamodel API, partially implemented. WIP: populating query attributes in EntityConstructor.
 (commit: 65f35f2)

first test
 (commit: c6967b9)

param this implemented
 (commit: 673a0f1)

QueryFactory and TypedQuery test mocking
 (commit: 91d42e8)

fixed testReconstructEntityWithQueryAttribute
 (commit: 19da568)

Plural query attribute implemented, added integration tests.
 (commit: 7b18a52)

Implemented and tested lazy fetching for query attributes, fixed plural query attributes
 (commit: cc971e1)

added participation constraints support for query attributes
 (commit: f26edd9)

removed superfluous converter
 (commit: d4a633b)

added missing javadoc
 (commit: 6ebca84)

Removed commented code from EntityConstructorTest
 (commit: 490530a)

Fixed mistakes from code review
 (commit: e01d855)