Enable option to delete database entries upon plugin uninstall

[anonymized_14235950]

I've noticed that plugins often leave database entries behind even after uninstalling. I know that some do it for good reasons, but I think that users should have an easy way to delete them. I try out a lot of plugins and I don't want all their old data collecting in the database and sitting there for all of infinity.

I think WordPress should do one or both of the following:

1. Have an option to delete all the plugin's database entries when uninstalling, along with a message from the plugin author saying why that might be a bad idea.

2. Have an options in settings which shows a list of the plugins which have entries stored in the database, even if those plugins have already been uninstalled. Then users could retroactively go in and delete the entries if they decide they won't ever use the plugins again.

[netweb]

Duplicate of #26945.