add a include section with a url option to the config
recursively parse included config files for layer and include sections
fix cache misses caused by  casts to int in getcell(), should be round()
Added a note about using with mod_wsgi.
Check for Tile object by duck-typing, because under mod_wsgi, Layer.Tile and
TileCache.Layer.Tile aren't the same. (No idea why, but it seems to be a
pecularity of mod_wsgi module loading.)

Also raise a meaningful exception for a bit of code that has evidently *never*
worked anyway.
update url for mbtiles, old url was 404
add Doxyfile for building doxygen docs
document get method and sendfile, expire members
document get method
document _load, _load_recurse, and _loadFromSection methods7
document get method
revert a change made in r416 that broke Capabilities
rework testing of the Service instance's return objects
add layer config item expired to "expire" tiles based on a timestamp
test the mtime of each tile against the layer config expired setting and rebuild if nessasary
Disk cache ONLY!
commit file forgotten in r425
dont assume metatile is a string, it could be a bool
merge pg config sandbox branch into trunk
remove many debug messages
improve handling of connection to postgres errors
strip whitespace from urls before stuffing though the csv reader
fix typo
fix error handling on config reading
add and install a real wsgi app