Please provide a way to ignore all differences in control.tar

This bug was originally reported by Jakub Wilk (jwilk@debian.org) in Debian bug #797525:

I want to use diffoscope to compare two "Multi-Arch: same" debs of the 
same version but different architecture, to see differences that will 
cause co-installation conflicts.

This almost works currently, but there's a bit of noise that could be 
avoided. I'd like an option that does the following:
- Ignores all differences in control.tar.
- Ignores timestamp differences in data.tar.
- Disables fuzzy matching.