Unit test of diff command line

src/CmdLineTestGen/FixedStringElement.cpp

src/CmdLineTestGen/FixedStringElement.h

src/CmdLineTestGen/FloatElement.cpp

src/CmdLineTestGen/ListElement.cpp

src/CmdLineTestGen/StringElement.cpp

src/CmdLineTestGen/StringElement.h

src/CmdLineTestGen/d10_syntax.txt

src/CmdLineTestGen/d2b_syntax.txt

src/CmdLineTestGen/d3_syntax.txt

src/CmdLineTestGen/d9_syntax.txt

src/CmdLineTestGen/diff_syntax.txt

src/CommandLineTest.cpp

src/Makefile.am

src/ModuleUnitaryTest.cpp