Equi7grid

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- full update of all files _LAND.shp
- revision of all .prj files
- newly generated equi7grid.dat
- full update of coverland lists within equi7grid.dat

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- in image2equi7()...
- float64 removed
- same outputfile as input possible
- scale/offset is now accepted

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- bugfix in antimeridian handling
- image2equi7 ingests now .nc with "bands"

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- extended search_tiles_in_roi()
- fixes issues with projection strings when using GDAL>=3.0.0

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- fixed issues on antimeridian/dateline

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- minor update on lonlat2xy functions