Implemented tab dropping feature

Reviewer: Tiff Go (post commit)

Issue: none
fix for pre loading the advance list when opening a nursery

Reviewer: Tiff Go

Issue: GCP-9751
Added restrictions so that when user imports a data, user won't be able to access other tabs

Reviewer: Cy Casada

Issue: None
fix for pre loading the advance list when opening a nursery

Reviewer: Tiff Go

Issue: GCP-9751
Initial code changes for maintaining the snapshots list

reviewer: Tiff Go (post commit)

issue:     GCP-9751
Merge branch 'branch_maintain_germplasm'