merge
delete npy and npz
delete npy and npz
new scheme for yuan
Merge branch 'master' into yuan/dev
merge from master and pass the test for vector and site
delete the cout in Test_Vector
change the system size
add Lattice Plot and tests
add description to GetSite and PlotLattice
add != to operators
doesn't know what are these...
add .DS_Store to .gitignore