follow dev38, 1. optimize host_params init in ./extern/qcu/include/lattice_set.h; 2. optimize pyqcu init in ./test/test-bug17.ipynb; 3. find a very very strange bug in ./test/test-bug17.ipynb (in this file, cg_dslash should be same to matvec, but it does not happen, and more strange, this cg in python version runs right in sometime???). o.0