[Tilecache] WMS-time patch

[Steve Gaffigan]

Hello.  The attached patch adds support for caching by additional 
parameters, such as time, in WMS layers served through WMS requests. 
The patch updates 10 files.

To use, add the option, extra_params, to the relevant WMSLayer 
configuration section.  Then the specified parameters, and associated 
values from the request, will be used during cache key formation, and 
passed to the WMS layer backend.   The option only affects WMS layers 
served through TileCache.Services.WMS.  I've tested on Linux, under both 
CGI and mod_python, using [Google]Disk and Memcached caches.  I did not 
test using Amazon S3 cache.

TileCache is a great module.  Thanks.

Steve
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