bugfix alpine glacier

[luraess]

The fetch_glacier function was broken wrt alpine glacier selection. This PR fixes following:

• capitalise OST and WEST to match downloaded swissTLM3D data file names
• use joinpath for more robust path handling
• use DimPoints to retrieve DEM coordinates
• use updated Rasters.jl to fix mosaic function
• HDF5 I/O

[luraess]

Actually still not OK as it now hangs on mask(rasterDat; with=poly) ...

[mauro3]

Have a look at the code. I think that does what you want it to do.

[luraess]

Have a look at the code. I think that does what you want it to do.

Indeed - that does what I want. Thanks

[mauro3]

Note that the padding is now in meters and not gridpoints. (oops: edit "not" -> "now")

[luraess]

Will try to add some tests.

[mauro3]

Merge this now?

[luraess]

I'd say so, and I'll open a new issue to add tests.