Adds methods for dealing with term indices.
Adds methods for dealing with term indices.

Adds public methods ``AnnotatedInteractions2dArray.get_term_index()``
and complementary ``AnnotatedInteractions2dArray.get_term_from_index()``
for getting the index of a named term and getting the term name at a
particular index, respectively.

Also adds ``AnnotatedInteractions2dArray.get_link_index()`` and
``AnnotatedInteractionsArray.get_link_index()``. Also renames
``AnnotatedInteractionsArray.get_link()`` to ``get_termed_link()``,
consistent with ``AnnotatedInteractions2dArray``.

git-svn-id: 6391b798f55e3e4f5184bc6d113ebedc82009d5e@3777 1fbec0df-f6b4-4bca-857c-de90862b47bd

gotgenes/BiologicalProcessNetworks