Update to throw exceptions instead of logging errors [np-main]

[ixje]

This is a TODO for a project (see side bar)

Try to remove as much logging errors inside the business logic and raise Exceptions instead. Try to bubble it up to the point the that presentation layer (at this point only a CLI) can present useful and detailed information (if necessary).

• Do not use the generic Exception class but use the more specific exception classes like ValueError, TypeError etc (standard lib exceptions).
• Create custom exceptions if needed to give sufficient control to the end-user.

[jseagrave21]

@ixje are you sure this one is done? I don't see a specific PR that addresses this issue.