cosmetic changes
[exploration] Fix scales
[exploration] Fix segfault for non integer values.

Thanks to Pierrick K. for reporting.
[gdal] create cpp w/gdal dep

No need of GDAL for the .hpp
[cmake] use glob src/*.cpp
[test] add separate gdal test
[gladys] weight as const reference in nav_graph
[weight_map] get reference to map (non const)
[weight_map] setup weight band
[python] update gladysplay w/weight_map
[weight_map] add cstr w/gdal weight-map
[python] clean gladysplay frontier scale
Fix idx method [scale]
[gdal] add custom origin
[test] add gdal scale test
[test] remove old python test
[test] add gdal custom origine io test
Replace idx -> index (clear name)
[gdal] replace bands_name -> names
[gdal] pretify...