add EAM Force Field
Fixed a bug in countTokens in StringTokenizer
refine factory pattern to make it initialized correctly
brains get built
UseTheForce get built
add Electrostatic AtomType Section Parser
refactory integrator
DUFF is almost done except error checking
DUFF is almost done except error checking
adding DUFF parser
adding DUFF class; adding checking statement to nextTokenAsInt and nextTokenAsFloat in StringTokenizer
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