Check for duplication of gml ids
Adapted IdChecker to changed GMLObjectVisitor
Started implementation of BLOB index
Added initial support for indexing primitive-valued XPaths in BLOB mode.
Added support for partial SQL/partial in-memory filtering to AbstractWhereBuilder
Added configuration options for indexing xpaths in BLOB mode. Added management and auto-population of index tables (currently only for PostgreSQL).
Update blob index for updates
Merge branch '3.4/feature/sql-featurestore-blob-index' of github.com:m-click/deegree3 into 3.4/feature/sql-featurestore-blob-index

Conflicts:
	deegree-datastores/deegree-featurestores/deegree-featurestore-sql/src/main/java/org/deegree/feature/persistence/sql/SQLFeatureStoreTransaction.java
	deegree-datastores/deegree-featurestores/deegree-featurestore-sql/src/main/java/org/deegree/feature/persistence/sql/blob/BlobMapping.java
	deegree-datastores/deegree-featurestores/deegree-featurestore-sql/src/main/java/org/deegree/feature/persistence/sql/blob/index/BlobIndex.java
	deegree-datastores/deegree-featurestores/deegree-featurestore-sql/src/main/java/org/deegree/feature/persistence/sql/blob/index/IndexedXpath.java
Fixed connection close problem due to merge