Terms-based deltas recorded.
Terms-based deltas recorded.

Distinguished between "link (un)selection" and "term (un)selection".
Deltas now specify which was performed.

Swapped the order of superclass link (un)selection methods being called
and ``_(un)select_terms_via_link()`` so that the link selection will
override the delta created by any term selections that result from the
link being selected or unselected.

git-svn-id: 6391b798f55e3e4f5184bc6d113ebedc82009d5e@3816 1fbec0df-f6b4-4bca-857c-de90862b47bd

gotgenes/BiologicalProcessNetworks