* amar-src/amar.c, amar-src/amar.h, perl/Amanda/Archive.pod,
  perl/Amanda/Archive.swg: Add amar_size and
  amar_attr_add_data_fd_in_thread
* installcheck/Amanda_Archive.pl: Test amar_size.


git-svn-id: https://svn.code.sf.net/p/amanda/code/amanda/trunk@5584 a8d146d6-cc15-0410-8900-af154a0219e0