Remove GPL Headers

CMakeLists.txt

doc/additionalDoc/package.h

include/dynamic-graph/all-commands.h

include/dynamic-graph/all-signals.h

include/dynamic-graph/command-bind.h

include/dynamic-graph/command-direct-getter.h

include/dynamic-graph/command-direct-setter.h

include/dynamic-graph/command-getter.h

include/dynamic-graph/command-getter.t.cpp

include/dynamic-graph/command-setter.h

include/dynamic-graph/command-setter.t.cpp

include/dynamic-graph/command.h

include/dynamic-graph/debug.h

include/dynamic-graph/dynamic-graph-api.h

include/dynamic-graph/eigen-io.h

include/dynamic-graph/entity-helper.h

include/dynamic-graph/entity.h

include/dynamic-graph/exception-abstract.h

include/dynamic-graph/exception-factory.h

include/dynamic-graph/exception-signal.h