Merge people script should allow merging people who look different, but require a confirmation

[jfly]

(Suggested by @SAuroux here)

This will let us get rid of the javascript blocking dialog for confirmation, too.

[SAuroux]

After first practically using this script I have a slightly different proposal:

1. Display the information for both people: IDs, names, countries, DOBs
2. Let the user select each individual piece of data for the merge (if different):

For example, I just had to merge two people with same countryIDs, but the remaining data being different. I needed to end up with the following: ID1, name2, DOB2, (country)

[jfly]

This is feeling more and more like the edit/change person script. I'm now wondering if we can combine the 2 in a useful way...