Add listing of child items that are the same type as the parent

[Jari Häkkinen]

To be concrete I'll use Sample as example.

Looking at one sample in BASE I get a lot of nice information about that sample. There is a section for Extracts showing all extracts derived from the sample. I think there should be a similar section for pools showing which pooled samples the sample is a part of. To find the link between a pooled sample and another sample one has to go through the pooled sample, or through the event tab a few clicks down.

The above is of course true for all items that can be pooled.

[Martin Svensson]

(In [4539]) References #1092 Two of three biomaterials are updated and tested.Labeled extract is not done yet.

[Martin Svensson]

(In [4559]) Fixes #1092 Add listing of child items that are the same type as the parent

[Nicklas Nordborg]

(In [4611]) References #1092: Add listing of child items that are the same type as the parent

Fixed incorrect label.

[Nicklas Nordborg]

(In [4648]) References #1092: Add listing of child items that are the same type as the parent

Boolean parameter is required by PostgreSQL since 'pooled' is a boolean property.