mathop.h: adds sort
mathop.h: adds sort

WangDequan/vlfeat,richarddzh/vlfeat,CansenJIANG/vlfeat,hongzhili/vlfeat,WangDequan/vlfeat,rxl194/vlfeat,qubick/vlfeat,cvfish/vlfeat,vlfeat/vlfeat,qubick/vlfeat,cvfish/vlfeat,WangDequan/vlfeat,j-bo/vlfeat,erexhepa/vlfeat,j-bo/vlfeat,hongzhili/vlfeat,rxl194/vlfeat,vlfeat/vlfeat,mylxiaoyi/vlfeat,mylxiaoyi/vlfeat,qubick/vlfeat,vlfeat/vlfeat,hongzhili/vlfeat,CansenJIANG/vlfeat,vlfeat/vlfeat,WangDequan/vlfeat,erexhepa/vlfeat,hongzhili/vlfeat,richarddzh/vlfeat,richarddzh/vlfeat,hongzhili/vlfeat,rxl194/vlfeat,j-bo/vlfeat,cvfish/vlfeat,CansenJIANG/vlfeat,mylxiaoyi/vlfeat,erexhepa/vlfeat,cvfish/vlfeat,mylxiaoyi/vlfeat,vlfeat/vlfeat,hongzhili/vlfeat,rxl194/vlfeat,cvfish/vlfeat,mylxiaoyi/vlfeat,erexhepa/vlfeat,j-bo/vlfeat,erexhepa/vlfeat,erexhepa/vlfeat,j-bo/vlfeat,vlfeat/vlfeat,qubick/vlfeat,CansenJIANG/vlfeat,WangDequan/vlfeat,richarddzh/vlfeat,WangDequan/vlfeat,cvfish/vlfeat,richarddzh/vlfeat,CansenJIANG/vlfeat,richarddzh/vlfeat,rxl194/vlfeat,mylxiaoyi/vlfeat,qubick/vlfeat,rxl194/vlfeat,CansenJIANG/vlfeat,qubick/vlfeat