user input is automatically reformatted

In order for everything to look more presentable user input should be reformatted if it's not generated by the program. This will ensure eveything to look more uniform in case the user added too many spaces or none. There should also be an option to separate parentheses a given width from the closest number in both directions for readability.

No files, tests, or entry points are named. First clarify the exact formatting rules, whether formatting applies on input or display, and how the configurable parenthesis spacing should work; then locate the user-input handling and add tests that define the expected output.

Written by the indexing model from the issue text.