[Zope] Zope release numbers 1.9 to 2.1

[Hannu Krosing]

Paul Everitt wrote:
> 
> Philip wrote:
> 
> Let me go ahead and put this to rest.
> 
> x.y.z where:
> 
> x=major change, perhaps incompatible, just like Python
> y=features were added
> z=only bug fixes

but not always true:

java 1.0 -> 1.1 - major change, perhaps incompatible.

java 1.1 -> 2.0 - some features added.

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Hannu