Revert "Replaced 'focusesOn' by 'pointsAt' to resolve 'this'"

This reverts commit 9aea4309b4b3a85c8977a493026507c54aae9b6b.

Conflicts:
	src/dialogs/interpretation/resolution.py
Add a clear separation between the speaker's ID and the name of its model

Implemented via ResourcePool().get_model_mapping
Fix some tests
kb.lookup returns the concept type in lowercase
Fix when generating statements for negative sentences

This incurred an intermediate step where a concept was queried. To generate this request, no 'rdfs:label' statement
should be generated
PEP8 naming conventions

Nominal_Group -> NominalGroup
Verbal_Group -> VerbalGroup
Indirect_Complement -> IndirectComplement
pycharm: a little bit of PEP8 beautification
Updated Dialogs overview picture + added to README