covdet.c: tweaks defaults
covdet.c: tweaks defaults

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