This directory contains copies of update sites for third-party plugins
that we include in our target platform definition, but which are
unsigned in their official locations. We sign and re-publish them on
at products.reprezen.com/extgernal.

A few caveats:
* Artifact names and versions should be identical to those used by the
  official update site. We are not changing the actual content of the
  plugins - just signing it.
* Artifact "properties" that will be affected by code signing should
  be removed from the artifacts.jar / artifacts.xml files. Especially
  important is download.md5, as this is empirically known to prevent
  eclipse from accepting the update site content. Other properties,
  like sizes, don't appear to be as critical, but we remove them as
  well.
* When removing artifact properties, don't forget to adjust the 'size'
  attribute in the <properties> element. If all properties are
  removed, the <properties> element can be completely removed.
* If we switch to a new version of any of these plugins, we should
  prior versions here, to ensure that prior versions of our product
  will not encounter problems. This is why each update site is in a
  directory named for its release number.