Use less acronyms

[rafaqz]

Unless you're really deep in the field MDG, TPI, smf, pmf, psf and apsf are pretty obscure, an not really googleable.

It could be nice to having these written out a little more so people know whats here. Even just the file names would make it more transparent what is in this package.

[evetion]

Good point. I will rename and have aliases for the acronyms.

Also in terms of package name, GeoMorphology?

[rafaqz]

GeoMorphology.jl is much nicer! and more specific to what you have here.

Is it going to stay in Deltares (totally fine) or go to JuliaGeo? it could help visibility.

[rafaqz]

(By the way its working fine with Rasters.jl so far, you get a Raster back)