adding parts to the users guide regarding the Default guesser and guess_topologyAttributes

[aya9aladdin]

adding part to the universe page regarding the new guess_topologyAttributes
link: https://aya9aladdin.github.io/UserGuide/universe.html#guessing-topology-attributes

adding a new page for describing the guesser module and moving the guessers to a separate section called guessers list
link: https://aya9aladdin.github.io/UserGuide/formats/guessing.html

[orbeckst]

There is a conflict that needs to be resolved. I looked at it but I am not sure if the new text on guessers is supposed to be added to the other conflicting text or if it's supposed to (partially?) replace it. This requires an expert.