Merge pull request #506 in ZP/z-push from bugfix/ZP-1190-missing-manpages-for-installed-binaries to develop

* commit 'b6843635':
  ZP-1190 Install manpages in rpm packages
  ZP-1190 Install manpages in debian packages
  ZP-1190 Manpage for z-push-admin
  ZP-1190 Manpage for z-push-gab2contacts
  ZP-1190 Manpage for z-push-gabsync
  ZP-1190 Add links to wiki pages
  ZP-1190 Manpage for z-push-admin
  ZP-1190 Manpage for z-push-top