Comment 1 for bug 1586211

I tried my hand at updating the code to address this, and I think I've it working. Attached is the file with my code changes to the 5.1.3 trunk.

The code changes accomplish the following:
1) Make the date tolerance toggle and related labels appear all the time
2) Remove the need for the Refresh button by automatically refreshing the list when the tolerance is changed
3) Make the duplicate transaction details list dynamically appear when duplicates are detected (hidden otherwise)
4) Consistently take the date tolerance value into account when filtering

I hope I've made the UI changes correctly, but this is the first time I've worked with GTK, so please make sure I have not made any mistakes with the GTK related logic.