* perl/Amanda/Changer.pm: Improve error message,
* pel/Amanda/Config.swg, perl/Amanda/Util.swg: EXTEND stack when
  returning an array.


git-svn-id: https://amanda.svn.sourceforge.net/svnroot/amanda/amanda/branches/3_3@5189 a8d146d6-cc15-0410-8900-af154a0219e0