HSEARCH-1354 Typo
HSEARCH-1354 Adjusting old Junit 3 based test cases extending SearchTestCase to changes in this class

 Renaming SearchTestCase#getSessions to SearchTestCase#getSessionFactory
 Disallowing setCfg( null ) to rebuild configuration and introducing explicit forceConfigurationRebuild()
 Direct access to the session - getSession() must be used
 Import cleanups
HSEARCH-1354 Making JPATestCase a JUnit 4 only test base class
HSEARCH-1354 Junit 4 based tests extend now SearchTestCaseJUnit4
HSEARCH-1354 Some related test cleanups
HSEARCH-1354 Fixing error handling during indexing for mass indexer and adding test case