Add SEE ALSO to fdup.1
Remove unneccessary import in fdup.c
Make Makefile a bit more fancy
Add proto directory to .gitignore
Factor $(shell ...) stuff into ad-hoc generated Makefiles

Now we do not depend on GNU make supporting $(shell ...) anymore.
Fix make rule for source tarballs
More Makefile fancyness
Add target to generate a binary tarball
Make .gitignore rules capture all tarballs
Factor copy_attributes out of perform_link in action.c

This makes the code more modular and understandable. Also, fix a bug where
attributes were actually assigned in case of hardlinks.
Merge branch 'dev'
Update README
Update CHANGELOG