[OSM-dev] Generate image and tiles scripts

[Steven te Brinke]

Hello,

I've changed the generate_tiles and generate_image scripts to suit my 
needs and like to share them. The changes are:
- they can be called from the command line
- generate_tiles can resume at a given tile
- generate_image zoom levels work more like the slippy map zoom levels
As a side effect, a dependency on optparse is added.

If anyone with svn access likes these changes, they can be added there. 
Otherwise, they just stay on the mailinglist for those interested.

Greetings,
Steven
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