se2.9.1 me5.7.1 pe1.8.1

Closed tickets 5

• 77 Don't waste time comparing ref files together fixed
• 81 Show a message dialog when no duplicates are found fixed
• 80 Crash when adding iPhoto library twice fixed
• 74 The "Ignore small files" text field's value is not changed until the focus leaves the field fixed
• 75 Compute md5 hashes incrementally fixed