systemd support added.

systemd support added.

Sysstat service unit file has been added to replace init script
for systems with systemd support.

Mail from Peter Schiffer <pschiffe@redhat.com> 24/08/2012:

I am sending you a patch which adds support for systemd to sysstat. With this patch, configure script detects whether the system uses systemd, and if yes, it installs the unit file and enables the sysstat service. Then, init script is not used.

Systemd is default since Fedora 15, and many more distributions are slowly converting to it. For more information about it, see it's home page [1], man pages about unit files and integration into autotools can be found at [2 - 6]. General information about systemd can be found at [7].

What do you think?