[Tilecache] PATCH: X-SendFile and Expires headers

[mdeneen+tiles at saucontech.com]

This patch adds X-SendFile and the ability to set an Expires header.  It is a patch against tilecache 2.10.

Once applied, you can specify two new options under [cache] in the tilecache.cfg:

sendfile=yes
    This instructs tilecache to not read the tile image and send the fully qualified file name back to the web server in a X-SendFile header.  This avoids both python and the web server from holding the tile in memory at the same time.  The web server serves the tile directly to the client.
expires=n
    ...where nnnn is the number of hours from access time you wish to have the tiles possibly cached in the client browser.

I've tested this with lighttpd and apache (with mod_xsendfile http://tn123.ath.cx/mod_xsendfile/), and it works perfectly.  I've not tried seeding the cache with this.  You might have to disable sendfile to do that.  I'll test tomorrow.

Best Regards,
Mark Deneen
Saucon Technologies
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