[mod_tile] Fix double free bug in tile config loading

Reported by 7bitbyte, diagnosed by fabianpr on help.osm.org



git-svn-id: http://svn.openstreetmap.org/applications/utils/mod_tile@29190 b9d5c4c9-76e1-0310-9c85-f3177eceb1e4
[mod_tile] log and graph time to retrieve tiles from disk

Adds a munin graph to monitor the average time it takes to retrieve a served tile
from disk. This can be useful to check if the underlying disk system is fast enough
to handle the load of serving tiles. It does not include time required for pontential
rendering on the fly, nor the time to deliver the tile over the network.



git-svn-id: http://svn.openstreetmap.org/applications/utils/mod_tile@29195 b9d5c4c9-76e1-0310-9c85-f3177eceb1e4
[mod_tile] report atime in /status as well.

Add a warning to the status page that neither create time nor access time might be accurate.

Create time is manipulated by the tile expiry process, and atime is often disabled on the filesytem via noatime
for performance reasons.



git-svn-id: http://svn.openstreetmap.org/applications/utils/mod_tile@29196 b9d5c4c9-76e1-0310-9c85-f3177eceb1e4