BLD: Many warnings

[RuhiRG]

While building for pyseams:

 {aka 'const long unsigned int'} [-Wsign-compare]
   79 |       if (pos == std::string::npos)
      |           ~~~~^~~~~~~~~~~~~~~~~~~~
../subprojects/seams-core/src/topo_one_dim.cpp: In function 'std::vector<int> ring::findPrisms(std::vector<std::vector<int> >, std::vector<strucType>*, int*, int*, std::vector<std::vector<int> >, molSys::PointCloud<molSys::Point<double>, double>*, std::vector<double>*, bool)':
../subprojects/seams-core/src/topo_one_dim.cpp:316:16: warning: unused variable 'isKnownPrism' [-Wunused-variable]
  316 |           bool isKnownPrism = match::matchPrism(
      |                ^~~~~~~~~~~~
../subprojects/seams-core/src/topo_one_dim.cpp: In function 'bool ring::discardExtraTetragonBlocks(std::vector<int>*, std::vector<int>*, molSys::PointCloud<molSys::Point<double>, double>*)':
../subprojects/seams-core/src/topo_one_dim.cpp:494:10: warning: unused variable 'r_i' [-Wunused-variable]
  494 |   double r_i, r_j; // Coordinates in the axial dimension of iatom and jatom of
      |          ^~~
../subprojects/seams-core/src/topo_one_dim.cpp:494:15: warning: unused variable 'r_j' [-Wunused-variable]
  494 |   double r_i, r_j; // Coordinates in the axial dimension of iatom and jatom of
      |               ^~~
../subprojects/seams-core/src/topo_one_dim.cpp: In function 'int ring::assignPrismType(std::vector<std::vector<int> >, std::vector<int>, int, std::vector<strucType>, std::vector<int>*, std::vector<strucType>*)':
../subprojects/seams-core/src/topo_one_dim.cpp:712:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  712 |   for (int i = 0; i < listPrism.size(); i++) {
      |                   ~~^~~~~~~~~~~~~~~~~~
[22/26] Compiling C++ object subprojects/seams-core/libyodaLib.so.p/src_topo_two_dim.cpp.o
In file included from ../subprojects/seams-core/src/include/internal/seams_output.hpp:21,
                 from ../subprojects/seams-core/src/include/internal/ring.hpp:33,
                 from ../subprojects/seams-core/src/include/internal/order_parameter.hpp:32,
                 from ../subprojects/seams-core/src/include/internal/topo_two_dim.hpp:31,
                 from ../subprojects/seams-core/src/topo_two_dim.cpp:1:
../subprojects/seams-core/src/include/internal/generic.hpp: In function 'std::array<double, 3> gen::relDist(molSys::PointCloud<molSys::Point<double>, double>*, int, int)':
../subprojects/seams-core/src/include/internal/generic.hpp:204:10: warning: unused variable 'r2' [-Wunused-variable]
  204 |   double r2 = 0.0; // Squared absolute distance

From here. Would be nice for this to be cleaned up.