TODO Debian packaging of check_pgactivity:

  * common OPMDG upstream address: for now it's Thomas Reiss
 (https://github.com/OPMDG/check_pgactivity/issues/191)
  
  * lintian warnings:
  W: check-pgactivity: manpage-has-bad-whatis-entry usr/share/man/man1/check_pgactivity.1.gz


LATER:
  * bauen für Ubuntu 16.04 xenial, Debian 8 Jessie
  (see -backports or use debhelper 0 and ignore lintian complaints)

