Replaces JFreeChart 1.5.4 by JFreeChart 1.5.5 #204

Job	Run time
Compiling GAMA from PR branch / compilation	13m 2s
Compiling GAMA from base branch / compilation	13m 10s
Testing built GAMA / compilation	1m 8s
Display Spotbugs results	27s
	27m 47s

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