Added HSQL support
New Dependency Graph
LeftJoin Test
General SQL generator. It can handle arbitrary programs
dependencies for Jgraph
Merge branch 'develop' into feature/leftjoin

Conflicts:

obdalib-core/src/main/java/it/unibz/krdb/obda/parser/SQLQueryTranslator.
java
	obdalib-core/src/main/java/it/unibz/krdb/sql/DBMetadata.java
	obdalib-core/src/main/java/it/unibz/krdb/sql/ViewDefinition.java

reformulation-core/src/main/java/it/unibz/krdb/obda/owlrefplatform/core/
basicoperations/DatalogNormalizer.java
resolved conflicts that appeared when integrating with develop
Fixed issue with wrong merge from develop on DatalogNormalizer.java that
breaked the tests. now everything is ok.
Fixed issue with wrong merge from develop on DatalogNormalizer.java that
breaked the tests. now everything is ok.
Merge remote-tracking branch 'origin/feature/leftjoin' into feature/leftjoin
deleted log file
Merge branch 'develop' into feature/leftjoin
Test dependency graph
optional/LJ current changes
changed comments
Moved LeftJoin test from MySQL to H2 in-memory
Merge branch 'feature/leftjoin' of https://github.com/ontop/ontop.git into feature/leftjoin
leftjoin update test case
finished the unfolding of the query
I dont know