[Merkaartor] Downloading OSM-data in several parts

[Timo Schlüßler]

Hello,

I think you didn't get my first emails about this subject so I send it 
here again.

When zooming is at an low level and you want to download OSM-data there 
comes this very serious error with the hint that zooming in could help. 
So downloading large areas at once is not possible.
To fix this I changed the code to let merkaartor automatically download 
the data in several parts/tiles. Through this you can download areas as 
large as you want to without that error, but it needs a lot of time.

Please tell me if you think this is a good thing and maybe someone can 
apply the patch to the svn-repos.


You can vary the size of the parts with the #define directive for MAXLON 
and MAXLAT. The highest possible value is 0.25° (taken from the api 
documentation on wiki.openstreetmap.org). Currently I set the values to 
0.0005 Rad for better testing and faster results (a 0.25° part needs 
some time). You may also want to try #define DEBUG_TILES.


thx in advance,
timo
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