#677 create option for detailed log entry for edits

[dnhale]

When the admin approves a change/addition made by
another user, there is very little information stored
in the log file, certainly not enough information to
back out or reproduce the change based on information
stored in the log. I would like to see either a
global setting to record this additional data with
every change (same info being presented to the admin
for review), or a checkbox on the admin page which
allows the admin to include this extra data in the
log for only that specific change.

This functionality would be particularly helpful if
the gedcom file is being overwritten with a new
upload, and all changes since a particular date will
be lost.