Assigned generic types to commandTable (Hash Table).
Deleted private method in Tangle.java that did nothing.
Refactoring and renaming variable for readability.
Deleted FilterUtil.java because it was used nowhere.
Extracted operation constants in Command.java for readability.
Deleted unused image icons.

Should replace with better images.
Renamed GInterface.java to TangleSolve.java.
Renamed StatementsInterface.java to TheoremInterface.java.
Renamed RefListPane.java to ReferenceListPane.java.
Renamed EquationSolver.java to EquationSolverUtil.java.
Renamed Constants.java to TreeDisplayString.java.
Corrected variable naming scheme.
Deleted overide method that did nothing.
Wrote setKnotColor method to remove redundancy.
Renamed and refactored variables.
Minor formatting change.
Minor formatting change.
Renamed and refactored variables for readability.
Minor reformatting of comments.
Minor reformatting of comments and renamed variables for readability.