[Tile-serving] [osm2pgsql] Added link to explanation of web mercator and removed typo in shell comm... (#63)

[Paul Norman]

The problem with postgis is there are so many old versions out there since packaging is way behind.

Perhaps we should modify the .sql to only insert if there isn't already a 900913 in the table?

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https://github.com/openstreetmap/osm2pgsql/pull/63#issuecomment-24034624
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