MARMOTTA-530: checking presence of anchor in the describedby-Link header.
MARMOTTA-532: Removed custom implementation for parsing EntityTags, since the bug was fixed upstream.
MARMOTTA-461: Added initial support for the Prefer header in LDP
MARMOTTA-521: test preferContainmentTriples passes
MARMOTTA-514: test regression: implementing MARMOTTA-461 causes some tests to fail...