tJ model implementation: add SPINHOPPING and doublon constraints

[tmisawa]

Summary

Implemented the tJ model in mVMC (branch: tJ).

5b06975

This change mainly adds doublon-forbidden logic in Monte Carlo updates, initial configuration, and Green’s function evaluation.

Main changes

• Added SPINHOPPING to UpdateType
• NExUpdatePath=4 uses SPINHOPPING; NExUpdatePath=5 uses EXCHANGE/SPINHOPPING
• Added tJ doublon-forbidden conditions in initial configuration
• Added tJ conditions to GreenFunc1/2 (normal, real, fsz, fsz_real paths)
• Added post-hop doublon checks that revert state and return 0.0 when violated

Modified files

• src/mVMC/include/vmcmake.h
• src/mVMC/include/vmcmake_fsz.h
• src/mVMC/locgrn.c
• src/mVMC/locgrn_real.c
• src/mVMC/locgrn_fsz.c
• src/mVMC/locgrn_fsz_real.c
• src/mVMC/vmcmake.c
• src/mVMC/vmcmake_real.c
• src/mVMC/vmcmake_fsz.c
• src/mVMC/vmcmake_fsz_real.c

Notes

• BackFlow and Lanczos paths are not supported in this implementation.