Signed and unsigned compilation errors

[vukadinlaza]

During my test of MSVC build I have found some places in the code that where compiler produce reasonable error. One of them is about unsigned types compared with signed or unary minus applied to unsigned. They clearly are developer's mistakes and needs to be fixed, as the may introduce bugs in logic.

[00:02:46] C:\projects\metric-wheels\metric\modules\distance\k-related\Standards.cpp(108,31): warning C4018: '<': signed/unsigned mismatch (compiling source file C:\projects\metric-wheels\metric\python\src\distance\standards.cpp) [C:\projects\metric-wheels\metric\python\build\temp.win-amd64-3.8\Release\src\distance\distance.vcxproj]
[00:02:46] C:\projects\metric-wheels\metric\python\src\distance\standards.cpp(67): message : see reference to function template instantiation 'V metric::Chebyshev<V>::operator ()<Container>(const Container &,const Container &) const' being compiled [C:\projects\metric-wheels\metric\python\build\temp.win-amd64-3.8\Release\src\distance\distance.vcxproj]
[00:02:46]           with
[00:02:46]           [
[00:02:46]               V=double,
[00:02:46]               Container=NumpyToVectorAdapter<double>
[00:02:46]           ]

[00:06:54] C:\projects\metric-wheels\metric\python\..\modules/utils/datasets.hpp(179,30): warning C4146: unary minus operator applied to unsigned type, result still unsigned (compiling source file C:\projects\metric-wheels\metric\python\src\utils\dataset.cpp) [C:\projects\metric-wheels\metric\python\build\temp.win-amd64-3.8\Release\src\utils\utils.vcxproj]

[00:05:36] C:\projects\metric-wheels\metric\modules\correlation\mgc.cpp(367,1): warning C4146: unary minus operator applied to unsigned type, result still unsigned [C:\projects\metric-wheels\metric\python\build\temp.win-amd64-3.8\Release\src\correlation\mgc.vcxproj]
[00:05:36] C:\projects\metric-wheels\metric\python\src\correlation\mgc.cpp(71): message : see reference to function template instantiation 'std::vector<double,std::allocator<double>> metric::MGC_direct::xcorr<T>(const blaze::SymmetricMatrix<blaze::DynamicMatrix<double,false>,false,true,true> &,const blaze::SymmetricMatrix<blaze::DynamicMatrix<double,false>,false,true,true> &,const unsigned int)' being compiled [C:\projects\metric-wheels\metric\python\build\temp.win-amd64-3.8\Release\src\correlation\mgc.vcxproj]

[00:05:36] C:\projects\metric-wheels\metric\modules\correlation\mgc.cpp(372,1): warning C4146: unary minus operator applied to unsigned type, result still unsigned [C:\projects\metric-wheels\metric\python\build\temp.win-amd64-3.8\Release\src\correlation\mgc.vcxproj]