Implement display of alternate accessions.
Don't assume alterate_accessions exists in the object.
Incorrect field for antibody.
Add test for alternate accessions to experiments.
Merging in master.
Display biosample_term_name even if no biosamples attached.
Merging from fix-search branch
Remove possibility of empty Assay panel in experiment page.
Update Jest test for biosample summary with and without biosamples.
add nestable page collection
merge in properties from default pages
change approach: embed default pages in collection/homepage views
include parent field when editing a page
make it possible to clear the parent property (and linkTo properties in general)
validate that page parent is not a collection default page (and add registry of validator functions)
show validation errors next to their respective fields
Merging master.
Merging in master.
Simplify alternate accession Jest test data.
Merging in master.