adjmat and property-order

[LoePhi]

Issue

When using d3graph.graph() or d3graph.set_node_properties(), the order of properties provided needs to match the order of the instance attribute adjmat. I don't hink this behaviour is documented and it can lead to some issues.

1. The adjmat attribute does not maintain the same order as the user-provided adjacency matrix. This discrepancy arises because d3graph.graph() calls d3graph.set_edge_properties(), which reorders the matrix into alphabetical order.
2. Attempting to provide properties in alphabetical order may fail. d3graph.graph() calls data_checks, which calls remove_special_chars. This changes the node names, which can also change their alphabetical order (for example if the name start with a special character, like "µm_wave"). Thus d3graph.set_edge_properties() might produce a different order for adjmat than one would obtain ordering the user-provided adjacency matrix.

Suggested fix

• Document that properties need to given in alphabetic order.
• Make the removal of optional chars optional and/or issue a warning if special chars are removed from the node names