Fixes, added keep alive for conversation

TapSchemaManagerAPI/pom.xml

...nagerAPI/src/main/java/it/inaf/ia2/tsm/api/DBWrapper.java

...aManagerAPI/src/main/java/it/inaf/ia2/tsm/api/DaoKey.java

TapSchemaManagerAPI/src/main/resources/log4j.properties

...ManagerAPI/src/test/java/it/inaf/ia2/tsm/api/TestAll.java

TapSchemaManagerWebApp/pom.xml

...c/main/java/it/inaf/ia2/tsm/webapp/ApplicationConfig.java

...in/java/it/inaf/ia2/tsm/webapp/ConsistencyChecksBean.java

...p/src/main/java/it/inaf/ia2/tsm/webapp/KeepAliveBean.java

...c/main/java/it/inaf/ia2/tsm/webapp/KeepAliveResource.java

...ain/java/it/inaf/ia2/tsm/webapp/TapSchemaEditingBean.java

...hemaManagerWebApp/src/main/webapp/consistencyChecks.xhtml

TapSchemaManagerWebApp/src/main/webapp/index.xhtml

...maManagerWebApp/src/main/webapp/resources/js/keepalive.js

TapSchemaManagerWebApp/src/main/webapp/schemaSelection.xhtml

...chemaManagerWebApp/src/main/webapp/tapSchemaEditing.xhtml