Fix header of resource view

In dashboard and in computer monitoring resource
Merge branch 'glpi0.84' of https://github.com/ddurieux/glpi_monitoring into glpi0.84
Fix update (create right cron and remove old)
Merge branch 'glpi0.84' of https://github.com/ddurieux/glpi_monitoring into glpi0.84
Perfdata counters view
Add begin add gauge
Merge branch 'mohierf_glpi0.84' into glpi0.84

Conflicts:
	inc/serviceevent.class.php
COntinue gauges