add support for "statementsToConvertColumnType" to _OpenBasePlugIn
OpenBasePlugIn.OpenBaseSynchronizationFactory - added statementsToConvertColumnType and statementsToDeleteColumnNamed ERXSQLHelper.OpenBaseSQLHelper - added support creating indexes, and overriding externalTypeForJDBCType Added com.openbase.OpenBasePlugInPrinciple.java
updates to OpenBaseSQLHelper for better sqlForCreateIndex support