Tidy up old changes editing files

Signed-off-by: David Greaves <david.greaves@jollamobile.com>
Arg is now --auto
Don't miss added/removed files when applying patches

Signed-off-by: David Greaves <david.greaves@jollamobile.com>
Document the --pristine flag

Signed-off-by: David Greaves <david.greaves@jollamobile.com>
Force upack to be pristine tar

Signed-off-by: David Greaves <david.greaves@jollamobile.com>