no automatic updates of packages with major version change

[Jeff Gentry]

> There is still a problem with this versioning system for R packages. When
> somebody wants to keep an old major version to keep compatibility with old
> scripts, and want also to install the brand new major version to start
> exploring it. In this case, there is a conflict because both packages bear
> the same name! The simplest solution would be to change the name of the
> package (for 'PkgName' for version 1.Y.Z to 'PkgName2' for version
> 2.Y.Z,...) allowing two or more major versions to live in the same system,

Another thing you can do for now is to maintain multiple R library
directories.  You would just have to be careful with the .libPaths(), etc.

This doesn't solve the problem of having them simultaneously loaded, but
for installs it will work.

-J

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