Provide some means to change the behavior of a single package instance
- 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.
