Big refactoring in order to allow multiple TAP versions (2)

TASMAN-core/pom.xml

TASMAN-core/src/main/java/it/inaf/ia2/tsm/ChildEntity.java

TASMAN-core/src/main/java/it/inaf/ia2/tsm/Column.java

...core/src/main/java/it/inaf/ia2/tsm/ConsistencyChecks.java

...AN-core/src/main/java/it/inaf/ia2/tsm/EntityProperty.java

TASMAN-core/src/main/java/it/inaf/ia2/tsm/Key.java

TASMAN-core/src/main/java/it/inaf/ia2/tsm/KeyColumn.java

TASMAN-core/src/main/java/it/inaf/ia2/tsm/KeyMetadata.java

TASMAN-core/src/main/java/it/inaf/ia2/tsm/Schema.java

TASMAN-core/src/main/java/it/inaf/ia2/tsm/TSMUtil.java

TASMAN-core/src/main/java/it/inaf/ia2/tsm/Table.java

TASMAN-core/src/main/java/it/inaf/ia2/tsm/TapSchema.java

...N-core/src/main/java/it/inaf/ia2/tsm/TapSchemaEntity.java

...-core/src/main/java/it/inaf/ia2/tsm/UpdateOperations.java

...ore/src/main/java/it/inaf/ia2/tsm/datalayer/DBBroker.java

...main/java/it/inaf/ia2/tsm/datalayer/DBBrokerTemplate.java

...n/java/it/inaf/ia2/tsm/datalayer/mysql/MySQLDBBroker.java

...ava/it/inaf/ia2/tsm/datalayer/pgsql/PostgresDBBroker.java

...re/src/main/java/it/inaf/ia2/tsm/model/PropertyModel.java

...src/main/java/it/inaf/ia2/tsm/model/PropertyXMLModel.java