construct_info()

[moodymudskipper]

When we construct an object we use mostly the default constructors and it takes a bit of research to know how we can tweak the output.
maybe we can have construct_info() just like we have construct_issues() (same principle, call without args for last, or call on an object).
We store in the object the constructive options that were actually used.
And a print method prints the used constructors and also fetches the other possible choices.

This way:

• a constructive object contains the specs of how it was creates, could be useful at some point
• we can use a workflow of default construction => construct_info() => tweak construction with minimal doc browsing