Resolve "Most Similar Molecule"

See merge request ec504/ec504_projects/group4!11

# Conflicts:
#   src/edu/bu/ec504/project/Main.java

Testcases CLI Update to molecule_input.py

See merge request ec504/ec504_projects/group4!12

Implemented subgraph search

See merge request ec504/ec504_projects/group4!10

# Conflicts:
#   src/Main.java
#   src/MoleculeDatabase.java
#   src/edu/bu/ec504/project/Molecule.java

# Conflicts:
#   src/Main.java
#   src/MoleculeDatabase.java
#   src/edu/bu/ec504/project/Molecule.java

Resolve "Graphical User Interface"

See merge request ec504/ec504_projects/group4!7