Webminstats

This is a consolidation release.

Some bugs were fixed in the diskio module,
the mem module on CentOS,
the load module,
and the batch_graph script.

This release can choose a temp unit in the hddtemp module,
links to all networks in the network module,
and adds an init button (to initialize default parameters).

Some improvements were made to avoid cache problems,
to remove duplicate code,
and to detect upstart/systemd.