Some refactoring: avoid re-parsing the expressions, remove the necessity for a seperate unknowns file and better loops
Removed unused import
Enforced PEP8
Removed unused variables
Merge branch 'master' of https://github.com/Johies/CSC411-JJ-Coetzee

Conflicts:
	Networkx.py
Merge branch 'master' of https://github.com/Johies/CSC411-JJ-Coetzee
Streamlined tab selection code