Remap and rename

[hmonnery]

Hi,

I've run into a couple of issues with remap and rename. Apologies if it's just my own mistakes!

• When using solve_impulse_linear, it seems like remapping a solved block gives an error, because the H_U_factored uses the remapped notation, whereas the rest of the internal block doesn't.
• Remapping a simple block seems to cause problems too, because self.inputs is remapped but compared to internal variable names.
• Renaming when a Parent has attribute .block, rather than .blocks, doesn't rename the children of .block, when they exist.

I've attached a notebook with minimal examples. Please let me know if there are issues.

Thanks!!
Hugo

Remap.ipynb.zip