blocked_connection_impl
=======================

Connects two layers with blocked_representations with matching numbers of blocks;
corresponding blocks are attached with identical inner connections.

Parameters
----------

Is a parameter\_client that copies the names of the (first of the) inner
connections, and delegates parameter setting to each of the inner 
connections (iteratively).

set_inner_type
--------------

	some_bconn set_inner_type subtype

When establishing a blocked_connection `some_bconn` manually, set the
subtype of the inner connections of `some_bconn` to `subtype`.

set_target_inner_rep
--------------------

	some_bconn set_target_inner_rep trep

When establishing a blocked_connection `some_bconn` manually, indicate that
the inner representation of the blocked_representation of the target is
`trep`.  *In future, this may become redundant.*