Convert all raw bioassay items to derived bioassays

[Nicklas Nordborg]

Reggie is changing all raw bioassays to derived bioassays in #1581. The variant search must also be update to match the changes.

[Nicklas Nordborg]

In 7726:

References #1593: Convert all raw bioassay items to derived bioassays

Changed the item lists to use derived bioassays and subtypes instead of raw bioassays and raw data types.

[Nicklas Nordborg]

In 7727:

References #1593: Convert all raw bioassay items to derived bioassays

The extensions are now linked to derived bioassays instead of raw bioassays. A lot of the functionality is not yet working properly.

[Nicklas Nordborg]

In 7728:

References #1593: Convert all raw bioassay items to derived bioassays

Indexing and searching should now work.

[Nicklas Nordborg]

In 7729:

References #1593: Convert all raw bioassay items to derived bioassays

Removed code that is no longer used.