[Xastir] Goodbye GeoTIFF, Hello GeoPDF

[Eric Christensen]

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I recently learned that USGS will no longer release GeoTIFF-formatted
map files in favor of GeoPDF[0].  This will likely cause problems for
Xastir.  I did locate a instructions for converting the GeoPDF to
GeoTIFF[1].

[0] http://www.usgs.gov/faq/taxonomy/term/10413
[1] http://www.usgs.gov/faq/node/3704

- --Eric
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