Acknowledge only if Shinken accepts ...

Acknowledge in Glpi DB did not take care of Shinken Web service response
Clean log
Component alias/description

Add a description field in a component to allow :
- a service_description in Shinken
- a display_name friendly name in Glpi interface
When description field is not empty, it is used as service_description
for Shinken. If empty, component name is used for Shinken and UI.
Improved/tested hosts/resources view in dashboard

Improved queries on DB
Improved array view
Tested sorting/filtering on hosts/resources arrays
Merge branch 'glpi0.84' of https://github.com/ddurieux/glpi_monitoring into glpi0.84

Conflicts:
	inc/unavailability.class.php
Escape single quote for updating unavailabilities
Fix migration problem for profiles management
Display perfdata counters in resource view

Add a column in resources view to display perfdata counters (first and
last)

To be improved ...
Perfdata in resources view

1/ only if component has a graph template
2/ only if this graph template includes incremental DS in perfdata
3/ debug and json mode for Ajax get perfdata
Merge branch 'mohierf_glpi0.84' into glpi0.84