domain_adaptation → labels 关系

文件在 src/shogun/transfer/domain_adaptation	在 src/shogun/labels 中引用
DomainAdaptationMulticlassLibLinear.cpp	MulticlassLabels.h
DomainAdaptationSVMLinear.cpp	BinaryLabels.h
DomainAdaptationSVMLinear.cpp	Labels.h
DomainAdaptationSVMLinear.cpp	RegressionLabels.h