Lots of minor updates
- tab fixing
- some comments translated from spanish to english
- some things taken from the melville mudlib removed (as it does not have an open source license)

I think only a handful of melville code snippets remain here, but they are so short I did not found another way of rewriting the code… so I added a comment like "idea taken from the melville mudlib" hoping that won't be understood as a wrong use :(

(For future references: I checked before this commit and such situation appears only in five places in all the code)