vl_pr.m: adds an option to return stable precision and recall vectors
vl_pr.m: adds an option to return stable precision and recall vectors

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