* add test case for distinct on id property
* suggested fix for "select distinct id"
* add test case for distinct with fetch
* FIX: .setDistinct(true) can be used in conjunction with fetch() now
* add test case for distinct with beans that have a disriminator column
* FIX: discriminator column is only read if also Id is read.
* fine tuned the test case
* added test cases for findSingleAttributeList without distinct
* improved fix to support also findSingleAttribute without distinct
* ADD: Bonus test case - assertion not yet verified
