OpenACS

- New package parameter: PackageInitParameter

 When set to some value other than empty, the package "init" method

 (e.g. of xowiki::Package, or one of the subclasses) can handle

 this separately.

- This submit adds a handler for the value "swa-only", and returns

 a user-friendly message in this case. Of course, we could achieve

 something similar via permissions as well, but this allows us

 to tailor the behavior in more details.

- In general, this mechanism can also be used to provide some hints

 about some specific packages, or tailor these in some other ways.

- Currently, this new package parameter is not added to the

 .info file, so configure it via parameter pages.

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