Dissociated the displaying of changeset information in project labels from that of file labels, adding a preference option to control the former.

Was already merged in Bitbucket before import, marked as merged by the import user

I have the need to sometimes just see the local revision number, often when adding to a to-do list item the revision at which the item was completed, and I found it cumbersome to have to enable changeset information for ALL files just for that.

I've taken the liberty to separate whether project containers display changeset information from whether ALL files display that information. The former does not impact user-perceived performance, the latter does. At least to me, the former is quite useful, the latter is never useful.

In order to follow the defaults, the corresponding preference is set to false by default.