v0.10.23
Changes:
- vector component constraint
- center of mass analysis in msd.py and vacf.py
- modify pmd-format to include some system info at header
- remove {erg,frc,strs}.pmd from output
Bug fixes:
- fix not to read strs.pmd in elasticity.py
- fix mk_lspr_sngl which could affect some python programs.