Added constant values for XSD Datatypes code representation in SQLGenerator and QuestResultSet
Merge remote-tracking branch 'origin/develop' into feature/magic-num-refactor
Merge remote-tracking branch 'origin/develop' into feature/magic-num-refactor

Conflicts:
	reformulation-core/src/main/java/it/unibz/krdb/obda/owlrefplatform/core/sql/SQLGenerator.java
Rename TypeMapper to JdbcTypeMapper, use  the new class QuestTypeMapper
Add COL_TYPE NULL
Fixed test not to consider auxiliary role
Merge branch 'feature/magic-num-refactor' into develop