More general `ch_names`

[thorwhalen]

Simple version: Add include_label_nodes==False param in ch_names

By default, ch_names only changes identifiers.

Sometimes a user might want to also change label_nodes.

More general version

In fact, they may also want to change params (will require i2.wrapper.ch_names).

So perhaps this issue can become.

The default would be ('name', 'out') (soon to be unified into id_), but could be ('name', 'out', 'func_label, 'params').

Note: If either out or params are changed, then bind needs to be changed accordingly.