This Fixes #4820 and #4786
This combine patch includes:

- send the last time when data was uploaded
- send the error message if data could not be uploaded, otherwise sends 'ok'
- warning if a disk partition is above 85% full
- warning if couch process are maxed out (25 or above)

The thresholds for diskUse and couchProcess are set in the config file
Set status = 	'warning' when disk alarm
		'error' when couch process alarm or data error
Merge pull request #4826 from lucacopa/alarming_improvements

Alarming improvements