* changed logic for enabling/disabling build targets. Now it supports
    constructs like:
    <build>
      <enable repository='openSUSE_10.3'/>
      <disable/>
    </build>
    Additionally all packages inherit the project wide build target settings
    and may override them.
  * this should fix #493892 ("Problems to enable build in single reporistory only")
  * question: why does the srcserver care about the disable/enable stuff at all?
    Wouldn't it be more appropriate if this task is dedicated solely to the
    scheduler (even if the srcserver might read the deps for unneeded repos)?
- enabled():
  * the arch attribute has a higher score/exactness than all other attributes
    (repository).

- removed random filter in script/import
- thanks to jon nelson and michael e. brown for reporting this

Clones repositories without killing the schedulers ;)

- fix product converter cleanup

  usecase:
  <sometag>
    <disable repository="foo" />
    <enable />
  </sometag>
  if enabled is invoked with repoid="foo" the result is 0
  instead of 1. If there's a enabled and disabled tag with the same "exactness" 1 is returned.
- This issue raised up in #487400.

* make it easier to hit the links and not hitting "remove" cross
  unintentionally

  package update (bnc#486053).

  This helps to simplify package dependencies.

- moved remote project finder into DbProject model
- pass metadata requests for remote projects/packages to backend

- support 'repairlink'
- support 'lastworking' link query

  * a maintainer can be deleted as long as there's still another maintainer for a project/package
  * bugowners can be always deleted - it doesn't harm if a project/package has no bugowner
- fixes #444660: "Can't delete bugowner via webclient"