Permission denied errors logged at the DEBUG level

[francoislaurent]

The following pattern self-repeats:

29/05 15:29 escale.*[DEBUG]	index.getIndexChanges:803	downloading index for page '*'
29/05 15:29 escale.*[DEBUG]	index.download:145	downloading update data for page 'hit_analysis_t15'
29/05 15:32 escale.*[DEBUG]	manager.run:344	[Errno 13] Permission denied: '/Volumes/*/*'
29/05 15:32 escale.*[DEBUG]	timer.wait:107	sleeping 600 seconds
29/05 15:42 escale.*[DEBUG]	index.repairUpdates:733	releasing remnant lock for page '*'

Permission denied errors should not be logged at the DEBUG level.