revision-history considered harmful

[Robert Collins]

There was a discussion late at UBZ about removing revision-history as it
appears to be somewhat harmful..

We've had a number of users use the property of pull to traverse any
link result in revnos vastly different than what they considered
'upstream'.

The revision-history file is somewhat special - its not reconstructable,
which makes it precious, its only identified by a URL, which makes URL's
important (where all our other data is not sensitive to things moving
around).

Martin and I sketched an approach where commits record the revno they
had at the time of commit, which combined with the branch nickname means
that doing a 'switch' of the revision-history when you 'pull' would be
understandable to users: you would *always* end up with the revno of the
branch you pulled from. 

We thought we could trial this by simply making the revision-history
replacement function of '--overwrite' always be on, without disabling
the divergence check. If that satisfied people, we can nuke
revision-history-the-file.

Rob


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