Bring back order editing functionality

[qzminski]

This pull requests brings back previous order editing functionality, while maintaining the order log feature introduced in the last minor version.

[fritzmg]

What is the problem with the current implementation in 2.7.0?

[aschempp]

What is the problem with the current implementation in 2.7.0?

There are multiple problems:

1. it does not longer support "edit all" or "override all" to update the order status
2. it no longer supports custom fields in the order detail (edit) view