[RFC] Change handling of RelNotes

I went to clone git onto a memory stick today.  The default fs on the
sticks doesn't support symlinks.  After looking a little bit, the only
symlink I can see in the source tree is RelNotes.  It appears when
going to a new release the file gets created in /Documentation and the
symlink updated.

I propose we eliminate this symlink.  There are multiple other things
we can do to eliminate it and make the repository more flexible across
filesystems:

 * Always have current release in /Documentation/RelNotes and keep the
prior versions named the way they are maintained now.  When starting a
new release, rename the file and create it again.
 * Keep the current in RelNotes and leave the archived ones in
/Documentation.  Doing same content move and clear operation when
starting a new release.
 * Keep two copies RelNotes and /Documentation/RelNotes-X.X.X that
essentially have same content and RelNotes has a lot of churn
 * others...?

With this one abnormality the git repo on a normal flash drive doesn't
work... at least in my case.