Issue #586 Implement new Well package Henry example

[JoerivanEngelen]

Fixes #586 and #495

Description

This uses the new Well package instead of the WellDisStructured package in the Henry example. This was some leftover work.

Checklist

• [x] Links to correct issue
• [ ] Update changelog, if changes affect users
• [x] PR title starts with Issue #nr, e.g. Issue #737
• [ ] Unit tests were added
• [x] If feature added: Added/extended example