Added HSQL support
HSQL
Merge branch 'feature/hsql' of https://github.com/ontop/ontop into feature/hsql

Conflicts:
	quest-distribution/.settings/org.eclipse.core.resources.prefs
	quest-sparql-compliance/.settings/org.eclipse.core.resources.prefs
	reformulation-core/pom.xml
	reformulation-core/src/main/java/it/unibz/krdb/obda/owlrefplatform/core/Quest.java
	reformulation-core/src/main/java/it/unibz/krdb/obda/owlrefplatform/core/abox/RDBMSSIRepositoryManager.java
	reformulation-core/src/main/java/it/unibz/krdb/obda/owlrefplatform/core/queryevaluation/JDBCUtility.java
	reformulation-core/src/main/java/it/unibz/krdb/obda/owlrefplatform/core/resultset/QuestResultset.java
working on hsql
Merge branch 'feature/leftjoin' into feature/hsql
fix the SQL generator for hsql
Merge branch 'feature/hsql' into feature/swrlDatalog

Conflicts:
	reformulation-core/src/main/java/it/unibz/krdb/obda/owlrefplatform/core/sql/SQLGenerator.java
correct the JDBCDriver class and Boolean value of HSQL
Merge branch 'feature/hsql' into feature/swrlDatalog
swrl example
fix the hsql adapter
Merge branch 'feature/hsql' into feature/swrlDatalog
fixed Optional-filter
updated text to have URIs
working on the swrl example
fixed triple
fixed open world
added trim to remove spaces from uri in test case
fix inconsistency between cast and math boolean ops
polishing the code to pass the tests