increase size of plasmid / insert  lookup boxes in sample and DNA forms
select first entry in ComponentType dropdown instead of --- specify type ---
debug form checking (for Add New case)
select first entry in type selectbox instead of ---specify type---
remove block.super statements to avoid iterative code repetition; name endblocks
re-facture cell changeForm to use change_form_component base template.
introduce insert -> plasmid back-relation; refacture cell component change form