Xcode: fix indentation of python files
Xcode: fix indentation of python files

The indentation was incorrectly set to be the default 2. Python scripts use 4 spaces instead.

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