Merge remote branch 'mhy/multiproc' into merge

* mhy/multiproc:
  Get syntax right
  Deal with args being a tuple
  Add backwards compatibility code
  Make daklog be a Singleton
  Bugfixes for usage of DakProcessPool API
  remove unused variable
  Fix variable name
  Fix function name
  Fix up pool usage
  Enhance process pool implementation

Signed-off-by: Joerg Jaspert <joerg@debian.org>