Accept support for other specifications of AOI

[Florian-Katerndahl]

1. check program was compiled against GDAL (might even be an #ifdef preprocesor directive, if not: only direct BB or WRS-2 center coordinates ares allowed
2. Check for local resource path, potentially translate to WG84 on the fly
3. Check for remote resource path and open via GDAL virtual file (vismem)